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</pre><pre class="rust ">
<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>::{<span class="ident">max</span>, <span class="ident">min</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">u8</span>;

<span class="kw">use</span> <span class="ident">unicode</span>::<span class="ident">regex</span>::<span class="ident">UNICODE_CLASSES</span>;

<span class="kw">use</span> {
    <span class="ident">Expr</span>, <span class="ident">Repeater</span>, <span class="ident">CharClass</span>, <span class="ident">ClassRange</span>,
    <span class="ident">CaptureIndex</span>, <span class="ident">CaptureName</span>,
    <span class="ident">Error</span>, <span class="ident">ErrorKind</span>, <span class="prelude-ty">Result</span>,
};

<span class="doccomment">/// Parser state.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Keeps the entire input in memory and maintains a cursor (char offset).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It also keeps an expression stack, which is responsible for managing</span>
<span class="doccomment">/// grouped expressions and flag state.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Parser</span> {
    <span class="ident">chars</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span>,
    <span class="ident">chari</span>: <span class="ident">usize</span>,
    <span class="ident">stack</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span>,
    <span class="ident">caps</span>: <span class="ident">usize</span>,
    <span class="ident">names</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>, <span class="comment">// to check for duplicates</span>
    <span class="ident">flags</span>: <span class="ident">Flags</span>,
}

<span class="doccomment">/// Flag state used in the parser.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Flags</span> {
    <span class="doccomment">/// i</span>
    <span class="kw">pub</span> <span class="ident">casei</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// m</span>
    <span class="kw">pub</span> <span class="ident">multi</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// s</span>
    <span class="kw">pub</span> <span class="ident">dotnl</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// U</span>
    <span class="kw">pub</span> <span class="ident">swap_greed</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// x</span>
    <span class="kw">pub</span> <span class="ident">ignore_space</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// u</span>
    <span class="kw">pub</span> <span class="ident">unicode</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// Not actually a flag, but when disabled, every regex that may not match</span>
    <span class="doccomment">/// UTF-8 exclusively will cause the parser to return an error.</span>
    <span class="kw">pub</span> <span class="ident">allow_bytes</span>: <span class="ident">bool</span>,
}

<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Flags</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-&gt;</span> <span class="self">Self</span> {
        <span class="ident">Flags</span> {
            <span class="ident">casei</span>: <span class="bool-val">false</span>,
            <span class="ident">multi</span>: <span class="bool-val">false</span>,
            <span class="ident">dotnl</span>: <span class="bool-val">false</span>,
            <span class="ident">swap_greed</span>: <span class="bool-val">false</span>,
            <span class="ident">ignore_space</span>: <span class="bool-val">false</span>,
            <span class="ident">unicode</span>: <span class="bool-val">true</span>,
            <span class="ident">allow_bytes</span>: <span class="bool-val">false</span>,
        }
    }
}

<span class="doccomment">/// An ephemeral type for representing the expression stack.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Everything on the stack is either a regular expression or a marker</span>
<span class="doccomment">/// indicating the opening of a group (possibly non-capturing). The opening</span>
<span class="doccomment">/// of a group copies the current flag state, which is reset on the parser</span>
<span class="doccomment">/// state once the group closes.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">Build</span> {
    <span class="ident">Expr</span>(<span class="ident">Expr</span>),
    <span class="ident">LeftParen</span> {
        <span class="ident">i</span>: <span class="ident">CaptureIndex</span>,
        <span class="ident">name</span>: <span class="ident">CaptureName</span>,
        <span class="ident">chari</span>: <span class="ident">usize</span>,
        <span class="ident">old_flags</span>: <span class="ident">Flags</span>,
    },
}

<span class="comment">// Primary expression parsing routines.</span>
<span class="kw">impl</span> <span class="ident">Parser</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">flags</span>: <span class="ident">Flags</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Expr</span><span class="op">&gt;</span> {
        <span class="ident">Parser</span> {
            <span class="ident">chars</span>: <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">collect</span>(),
            <span class="ident">chari</span>: <span class="number">0</span>,
            <span class="ident">stack</span>: <span class="macro">vec</span><span class="macro">!</span>[],
            <span class="ident">caps</span>: <span class="number">0</span>,
            <span class="ident">names</span>: <span class="macro">vec</span><span class="macro">!</span>[],
            <span class="ident">flags</span>: <span class="ident">flags</span>,
        }.<span class="ident">parse_expr</span>()
    }

    <span class="comment">// Top-level expression parser.</span>
    <span class="comment">//</span>
    <span class="comment">// Starts at the beginning of the input and consumes until either the end</span>
    <span class="comment">// of input or an error.</span>
    <span class="kw">fn</span> <span class="ident">parse_expr</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Expr</span><span class="op">&gt;</span> {
        <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="kw">let</span> <span class="ident">build_expr</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur</span>() {
                <span class="string">&#39;\\&#39;</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_escape</span>()),
                <span class="string">&#39;|&#39;</span> <span class="op">=&gt;</span> { <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">alternate</span>()); <span class="self">self</span>.<span class="ident">bump</span>(); <span class="ident">e</span> }
                <span class="string">&#39;?&#39;</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_simple_repeat</span>(<span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span>)),
                <span class="string">&#39;*&#39;</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_simple_repeat</span>(<span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>)),
                <span class="string">&#39;+&#39;</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_simple_repeat</span>(<span class="ident">Repeater</span>::<span class="ident">OneOrMore</span>)),
                <span class="string">&#39;{&#39;</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_counted_repeat</span>()),
                <span class="string">&#39;[&#39;</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">maybe_parse_ascii</span>() {
                    <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_class</span>()),
                    <span class="prelude-val">Some</span>(<span class="ident">cls</span>) <span class="op">=&gt;</span> <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">cls</span>)),
                },
                <span class="string">&#39;^&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">multi</span> {
                        <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">StartLine</span>)
                    } <span class="kw">else</span> {
                        <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">StartText</span>)
                    }
                }
                <span class="string">&#39;$&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">multi</span> {
                        <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">EndLine</span>)
                    } <span class="kw">else</span> {
                        <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">EndText</span>)
                    }
                }
                <span class="string">&#39;.&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">dotnl</span> {
                        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                            <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">AnyChar</span>)
                        } <span class="kw">else</span> {
                            <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">allow_bytes</span> {
                                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>));
                            }
                            <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">AnyByte</span>)
                        }
                    } <span class="kw">else</span> {
                        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                            <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">AnyCharNoNL</span>)
                        } <span class="kw">else</span> {
                            <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">allow_bytes</span> {
                                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>));
                            }
                            <span class="self">self</span>.<span class="ident">parse_one</span>(<span class="ident">Expr</span>::<span class="ident">AnyByteNoNL</span>)
                        }
                    }
                }
                <span class="string">&#39;(&#39;</span> <span class="op">=&gt;</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_group</span>()),
                <span class="string">&#39;)&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">let</span> (<span class="ident">old_flags</span>, <span class="ident">e</span>) <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">close_paren</span>());
                    <span class="self">self</span>.<span class="ident">bump</span>();
                    <span class="self">self</span>.<span class="ident">flags</span> <span class="op">=</span> <span class="ident">old_flags</span>;
                    <span class="ident">e</span>
                }
                _ <span class="op">=&gt;</span> {
                    <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump</span>();
                    <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="ident">c</span>))
                }
            };
            <span class="kw">if</span> <span class="op">!</span><span class="ident">build_expr</span>.<span class="ident">is_empty</span>() {
                <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">build_expr</span>);
            }
        }
        <span class="self">self</span>.<span class="ident">finish_concat</span>()
    }

    <span class="comment">// Parses an escape sequence, e.g., \Ax</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `\`</span>
    <span class="comment">// End:   `x`</span>
    <span class="kw">fn</span> <span class="ident">parse_escape</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedEscapeEof</span>));
        }
        <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cur</span>();
        <span class="kw">if</span> <span class="ident">is_punct</span>(<span class="ident">c</span>) {
            <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump</span>();
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="ident">c</span>)));
        }
        <span class="kw">match</span> <span class="ident">c</span> {
            <span class="string">&#39;a&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="string">&#39;\x07&#39;</span>))) }
            <span class="string">&#39;f&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="string">&#39;\x0C&#39;</span>))) }
            <span class="string">&#39;t&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="string">&#39;\t&#39;</span>))) }
            <span class="string">&#39;n&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="string">&#39;\n&#39;</span>))) }
            <span class="string">&#39;r&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="string">&#39;\r&#39;</span>))) }
            <span class="string">&#39;v&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="string">&#39;\x0B&#39;</span>))) }
            <span class="string">&#39;A&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">StartText</span>)) }
            <span class="string">&#39;z&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">EndText</span>)) }
            <span class="string">&#39;b&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                    <span class="ident">Expr</span>::<span class="ident">WordBoundary</span>
                } <span class="kw">else</span> {
                    <span class="ident">Expr</span>::<span class="ident">WordBoundaryAscii</span>
                }))
            }
            <span class="string">&#39;B&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                    <span class="ident">Expr</span>::<span class="ident">NotWordBoundary</span>
                } <span class="kw">else</span> {
                    <span class="ident">Expr</span>::<span class="ident">NotWordBoundaryAscii</span>
                }))
            }
            <span class="string">&#39;0&#39;</span><span class="op">|</span><span class="string">&#39;1&#39;</span><span class="op">|</span><span class="string">&#39;2&#39;</span><span class="op">|</span><span class="string">&#39;3&#39;</span><span class="op">|</span><span class="string">&#39;4&#39;</span><span class="op">|</span><span class="string">&#39;5&#39;</span><span class="op">|</span><span class="string">&#39;6&#39;</span><span class="op">|</span><span class="string">&#39;7&#39;</span> <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">parse_octal</span>(),
            <span class="string">&#39;x&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="self">self</span>.<span class="ident">parse_hex</span>() }
            <span class="string">&#39;p&#39;</span><span class="op">|</span><span class="string">&#39;P&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="self">self</span>.<span class="ident">parse_unicode_class</span>(<span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;P&#39;</span>)
                    .<span class="ident">map</span>(<span class="op">|</span><span class="ident">cls</span><span class="op">|</span> <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">cls</span>)))
            }
            <span class="string">&#39;d&#39;</span><span class="op">|</span><span class="string">&#39;s&#39;</span><span class="op">|</span><span class="string">&#39;w&#39;</span><span class="op">|</span><span class="string">&#39;D&#39;</span><span class="op">|</span><span class="string">&#39;S&#39;</span><span class="op">|</span><span class="string">&#39;W&#39;</span> <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="self">self</span>.<span class="ident">parse_perl_class</span>(<span class="ident">c</span>))))
            }
            <span class="ident">c</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedEscape</span>(<span class="ident">c</span>))),
        }
    }

    <span class="comment">// Parses a group, e.g., `(abc)`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `(`</span>
    <span class="comment">// End:   `a`</span>
    <span class="comment">//</span>
    <span class="comment">// A more interesting example, `(?P&lt;foo&gt;abc)`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `(`</span>
    <span class="comment">// End:   `a`</span>
    <span class="kw">fn</span> <span class="ident">parse_group</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">chari</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chari</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">name</span>: <span class="ident">CaptureName</span> <span class="op">=</span> <span class="prelude-val">None</span>;
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&quot;?P&lt;&quot;</span>) {
            <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_group_name</span>());
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">names</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">n2</span><span class="op">|</span> <span class="ident">n2</span> <span class="op">==</span> <span class="kw-2">&amp;</span><span class="ident">n</span>) {
                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">DuplicateCaptureName</span>(<span class="ident">n</span>)));
            }
            <span class="self">self</span>.<span class="ident">names</span>.<span class="ident">push</span>(<span class="ident">n</span>.<span class="ident">clone</span>());
            <span class="ident">name</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">n</span>);
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&quot;?&quot;</span>) {
            <span class="comment">// This can never be capturing. It&#39;s either setting flags for</span>
            <span class="comment">// the current group, or it&#39;s opening a non-capturing group or</span>
            <span class="comment">// it&#39;s opening a group with a specific set of flags (which is</span>
            <span class="comment">// also non-capturing).</span>
            <span class="comment">// Anything else is an error.</span>
            <span class="kw">return</span> <span class="self">self</span>.<span class="ident">parse_group_flags</span>(<span class="ident">chari</span>);
        }
        <span class="self">self</span>.<span class="ident">caps</span> <span class="op">=</span> <span class="ident">checkadd</span>(<span class="self">self</span>.<span class="ident">caps</span>, <span class="number">1</span>);
        <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span> {
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">caps</span>),
            <span class="ident">name</span>: <span class="ident">name</span>,
            <span class="ident">chari</span>: <span class="ident">chari</span>,
            <span class="ident">old_flags</span>: <span class="self">self</span>.<span class="ident">flags</span>, <span class="comment">// no flags changed if we&#39;re here</span>
        })
    }

    <span class="comment">// Parses flags (inline or grouped), e.g., `(?s-i:abc)`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `s`</span>
    <span class="comment">// End:   `a`</span>
    <span class="comment">//</span>
    <span class="comment">// Another example, `(?s-i)a`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `s`</span>
    <span class="comment">// End:   `a`</span>
    <span class="kw">fn</span> <span class="ident">parse_group_flags</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">opening_chari</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">old_flags</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">flags</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sign</span> <span class="op">=</span> <span class="bool-val">true</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">false</span>;
        <span class="kw">loop</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
                <span class="comment">// e.g., (?i</span>
                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedFlagEof</span>));
            }
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur</span>() {
                <span class="string">&#39;i&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">casei</span> <span class="op">=</span> <span class="ident">sign</span>; <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">true</span> }
                <span class="string">&#39;m&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">multi</span> <span class="op">=</span> <span class="ident">sign</span>; <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">true</span> }
                <span class="string">&#39;s&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">dotnl</span> <span class="op">=</span> <span class="ident">sign</span>; <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">true</span> }
                <span class="string">&#39;U&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">swap_greed</span> <span class="op">=</span> <span class="ident">sign</span>; <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">true</span> }
                <span class="string">&#39;x&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">ignore_space</span> <span class="op">=</span> <span class="ident">sign</span>; <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">true</span> }
                <span class="string">&#39;u&#39;</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> <span class="op">=</span> <span class="ident">sign</span>; <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">true</span> }
                <span class="string">&#39;-&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">sign</span> {
                        <span class="comment">// e.g., (?-i-s)</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">DoubleFlagNegation</span>));
                    }
                    <span class="ident">sign</span> <span class="op">=</span> <span class="bool-val">false</span>;
                    <span class="ident">saw_flag</span> <span class="op">=</span> <span class="bool-val">false</span>;
                }
                <span class="string">&#39;)&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">saw_flag</span> {
                        <span class="comment">// e.g., (?)</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyFlagNegation</span>));
                    }
                    <span class="comment">// At this point, we&#39;re just changing the flags inside</span>
                    <span class="comment">// the current group, which means the old flags have</span>
                    <span class="comment">// been saved elsewhere. Our modifications in place are</span>
                    <span class="comment">// okey dokey!</span>
                    <span class="comment">//</span>
                    <span class="comment">// This particular flag expression only has a stateful</span>
                    <span class="comment">// impact on a regex&#39;s AST, so nothing gets explicitly</span>
                    <span class="comment">// added.</span>
                    <span class="self">self</span>.<span class="ident">bump</span>();
                    <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Empty</span>));
                }
                <span class="string">&#39;:&#39;</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="ident">sign</span> <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">saw_flag</span> {
                        <span class="comment">// e.g., (?i-:a)</span>
                        <span class="comment">// Note that if there&#39;s no negation, it&#39;s OK not</span>
                        <span class="comment">// to see flag, because you end up with a regular</span>
                        <span class="comment">// non-capturing group: `(?:a)`.</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyFlagNegation</span>));
                    }
                    <span class="self">self</span>.<span class="ident">bump</span>();
                    <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span> {
                        <span class="ident">i</span>: <span class="prelude-val">None</span>,
                        <span class="ident">name</span>: <span class="prelude-val">None</span>,
                        <span class="ident">chari</span>: <span class="ident">opening_chari</span>,
                        <span class="ident">old_flags</span>: <span class="ident">old_flags</span>,
                    });
                }
                <span class="comment">// e.g., (?z:a)</span>
                <span class="ident">c</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedFlag</span>(<span class="ident">c</span>))),
            }
            <span class="self">self</span>.<span class="ident">bump</span>();
        }
    }

    <span class="comment">// Parses a group name, e.g., `foo` in `(?P&lt;foo&gt;abc)`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `f`</span>
    <span class="comment">// End:   `a`</span>
    <span class="kw">fn</span> <span class="ident">parse_group_name</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">name</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
        <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">eof</span>() <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">peek_is</span>(<span class="string">&#39;&gt;&#39;</span>) {
            <span class="ident">name</span>.<span class="ident">push</span>(<span class="self">self</span>.<span class="ident">bump</span>());
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="comment">// e.g., (?P&lt;a</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnclosedCaptureName</span>(<span class="ident">name</span>)));
        }
        <span class="kw">let</span> <span class="ident">all_valid</span> <span class="op">=</span> <span class="ident">name</span>.<span class="ident">chars</span>().<span class="ident">all</span>(<span class="ident">is_valid_capture_char</span>);
        <span class="kw">match</span> <span class="ident">name</span>.<span class="ident">chars</span>().<span class="ident">next</span>() {
            <span class="comment">// e.g., (?P&lt;&gt;a)</span>
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyCaptureName</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="kw">if</span> (<span class="ident">c</span> <span class="op">&gt;=</span> <span class="string">&#39;0&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">&#39;9&#39;</span>) <span class="op">||</span> <span class="op">!</span><span class="ident">all_valid</span> <span class="op">=&gt;</span> {
                <span class="comment">// e.g., (?P&lt;a#&gt;x)</span>
                <span class="comment">// e.g., (?P&lt;1a&gt;x)</span>
                <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidCaptureName</span>(<span class="ident">name</span>)))
            }
            _ <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">bump</span>(); <span class="comment">// for `&gt;`</span>
                <span class="prelude-val">Ok</span>(<span class="ident">name</span>)
            }
        }
    }

    <span class="comment">// Parses a counted repeition operator, e.g., `a{2,4}?z`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `{`</span>
    <span class="comment">// End:   `z`</span>
    <span class="kw">fn</span> <span class="ident">parse_counted_repeat</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(<span class="ident">ErrorKind</span>::<span class="ident">RepeaterExpectsExpr</span>)); <span class="comment">// e.g., ({5}</span>
        <span class="kw">if</span> <span class="op">!</span><span class="ident">e</span>.<span class="ident">can_repeat</span>() {
            <span class="comment">// e.g., a*{5}</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">RepeaterUnexpectedExpr</span>(<span class="ident">e</span>)));
        }
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">let</span> <span class="ident">min</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_decimal</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;,&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;}&#39;</span>));
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">max_opt</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">min</span>);
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;,&#39;</span>) {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">peek_is</span>(<span class="string">&#39;}&#39;</span>) {
                <span class="ident">max_opt</span> <span class="op">=</span> <span class="prelude-val">None</span>;
            } <span class="kw">else</span> {
                <span class="kw">let</span> <span class="ident">max</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_decimal</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;}&#39;</span>));
                <span class="kw">if</span> <span class="ident">min</span> <span class="op">&gt;</span> <span class="ident">max</span> {
                    <span class="comment">// e.g., a{2,1}</span>
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidRepeatRange</span> {
                        <span class="ident">min</span>: <span class="ident">min</span>,
                        <span class="ident">max</span>: <span class="ident">max</span>,
                    }));
                }
                <span class="ident">max_opt</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">max</span>);
            }
        }
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;}&#39;</span>) {
            <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnclosedRepeat</span>))
        } <span class="kw">else</span> {
            <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Repeat</span> {
                <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>),
                <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="ident">min</span>, <span class="ident">max</span>: <span class="ident">max_opt</span> },
                <span class="ident">greedy</span>: <span class="op">!</span><span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;?&#39;</span>) <span class="op">^</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">swap_greed</span>,
            }))
        }
    }

    <span class="comment">// Parses a simple repetition operator, e.g., `a+?z`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `+`</span>
    <span class="comment">// End:   `z`</span>
    <span class="comment">//</span>
    <span class="comment">// N.B. &quot;simple&quot; in this context means &quot;not min/max repetition&quot;,</span>
    <span class="comment">// e.g., `a{1,2}`.</span>
    <span class="kw">fn</span> <span class="ident">parse_simple_repeat</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">rep</span>: <span class="ident">Repeater</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pop</span>(<span class="ident">ErrorKind</span>::<span class="ident">RepeaterExpectsExpr</span>)); <span class="comment">// e.g., (*</span>
        <span class="kw">if</span> <span class="op">!</span><span class="ident">e</span>.<span class="ident">can_repeat</span>() {
            <span class="comment">// e.g., a**</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">RepeaterUnexpectedExpr</span>(<span class="ident">e</span>)));
        }
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">e</span>),
            <span class="ident">r</span>: <span class="ident">rep</span>,
            <span class="ident">greedy</span>: <span class="op">!</span><span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;?&#39;</span>) <span class="op">^</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">swap_greed</span>,
        }))
    }

    <span class="comment">// Parses a decimal number until the given character, e.g., `a{123,456}`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `1`</span>
    <span class="comment">// End:   `,` (where `until == &#39;,&#39;`)</span>
    <span class="kw">fn</span> <span class="ident">parse_decimal</span><span class="op">&lt;</span><span class="ident">B</span>: <span class="ident">Bumpable</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">until</span>: <span class="ident">B</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u32</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">bump_get</span>(<span class="ident">until</span>) {
            <span class="comment">// e.g., a{}</span>
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">MissingBase10</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">n</span>) <span class="op">=&gt;</span> {
                <span class="comment">// e.g., a{xyz</span>
                <span class="comment">// e.g., a{9999999999}</span>
                <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">n</span>.<span class="ident">trim</span>();
                <span class="ident">u32</span>::<span class="ident">from_str_radix</span>(<span class="ident">n</span>, <span class="number">10</span>)
                    .<span class="ident">map_err</span>(<span class="op">|</span>_<span class="op">|</span> <span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="ident">n</span>.<span class="ident">into</span>())))
            }
        }
    }

    <span class="comment">// Parses an octal number, up to 3 digits, e.g., `a\123b`</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `1`</span>
    <span class="comment">// End:   `b`</span>
    <span class="kw">fn</span> <span class="ident">parse_octal</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>; <span class="comment">// counter for limiting octal to 3 digits.</span>
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump_get</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> { <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>; <span class="ident">i</span> <span class="op">&lt;=</span> <span class="number">3</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&gt;=</span> <span class="string">&#39;0&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">&#39;7&#39;</span> })
                    .<span class="ident">expect</span>(<span class="string">&quot;octal string&quot;</span>); <span class="comment">// guaranteed at least 1 digit</span>
        <span class="comment">// I think both of the following unwraps are impossible to fail.</span>
        <span class="comment">// We limit it to a three digit octal number, which maxes out at</span>
        <span class="comment">// `0777` or `511` in decimal. Since all digits are in `0...7`, we&#39;ll</span>
        <span class="comment">// always have a valid `u32` number. Moreover, since all numbers in</span>
        <span class="comment">// the range `0...511` are valid Unicode scalar values, it will always</span>
        <span class="comment">// be a valid `char`.</span>
        <span class="comment">//</span>
        <span class="comment">// Hence, we `unwrap` with reckless abandon.</span>
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">u32</span>::<span class="ident">from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">n</span>, <span class="number">8</span>).<span class="ident">ok</span>().<span class="ident">expect</span>(<span class="string">&quot;valid octal number&quot;</span>);
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">u32_to_one_byte</span>(<span class="ident">n</span>)));
        }
        <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="ident">n</span>).<span class="ident">expect</span>(<span class="string">&quot;Unicode scalar value&quot;</span>);
        <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="ident">c</span>)))
    }

    <span class="comment">// Parses a hex number, e.g., `a\x5ab`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `5`</span>
    <span class="comment">// End:   `b`</span>
    <span class="comment">//</span>
    <span class="comment">// And also, `a\x{2603}b`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `{`</span>
    <span class="comment">// End:   `b`</span>
    <span class="kw">fn</span> <span class="ident">parse_hex</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;{&#39;</span>) {
            <span class="self">self</span>.<span class="ident">parse_hex_many_digits</span>()
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">parse_hex_two_digits</span>()
        }
    }

    <span class="comment">// Parses a many-digit hex number, e.g., `a\x{2603}b`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `2`</span>
    <span class="comment">// End:   `b`</span>
    <span class="kw">fn</span> <span class="ident">parse_hex_many_digits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>;

        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump_get</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;}&#39;</span>).<span class="ident">unwrap_or</span>(<span class="string">&quot;&quot;</span>.<span class="ident">into</span>());
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">u32</span>::<span class="ident">from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>, <span class="number">16</span>)
                         .<span class="ident">map_err</span>(<span class="op">|</span>_<span class="op">|</span> <span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidBase16</span>(<span class="ident">s</span>))));
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;}&#39;</span>) {
            <span class="comment">// e.g., a\x{d</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnclosedHex</span>));
        }
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">u32_to_one_byte</span>(<span class="ident">n</span>)));
        }
        <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="ident">n</span>)
                          .<span class="ident">ok_or</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidScalarValue</span>(<span class="ident">n</span>))));
        <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="ident">c</span>)))
    }

    <span class="comment">// Parses a two-digit hex number, e.g., `a\x5ab`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `5`</span>
    <span class="comment">// End:   `b`</span>
    <span class="kw">fn</span> <span class="ident">parse_hex_two_digits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>;

        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump_get</span>(<span class="op">|</span>_<span class="op">|</span> { <span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>; <span class="ident">i</span> <span class="op">&lt;=</span> <span class="number">2</span> }).<span class="ident">unwrap_or</span>(<span class="string">&quot;&quot;</span>.<span class="ident">into</span>());
        <span class="kw">if</span> <span class="ident">s</span>.<span class="ident">len</span>() <span class="op">&lt;</span> <span class="number">2</span> {
            <span class="comment">// e.g., a\x</span>
            <span class="comment">// e.g., a\xf</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedTwoDigitHexEof</span>));
        }
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="ident">u32</span>::<span class="ident">from_str_radix</span>(<span class="kw-2">&amp;</span><span class="ident">s</span>, <span class="number">16</span>)
                         .<span class="ident">map_err</span>(<span class="op">|</span>_<span class="op">|</span> <span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidBase16</span>(<span class="ident">s</span>))));
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">u32_to_one_byte</span>(<span class="ident">n</span>)));
        }
        <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">char</span>::<span class="ident">from_u32</span>(<span class="ident">n</span>).<span class="ident">expect</span>(<span class="string">&quot;Unicode scalar value&quot;</span>);
        <span class="prelude-val">Ok</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">lit</span>(<span class="ident">c</span>)))
    }

    <span class="comment">// Parses a character class, e.g., `[^a-zA-Z0-9]+`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `[`</span>
    <span class="comment">// End:   `+`</span>
    <span class="kw">fn</span> <span class="ident">parse_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="kw">let</span> <span class="ident">negated</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;^&#39;</span>);
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">class</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">empty</span>();
        <span class="kw">while</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;-&#39;</span>) {
            <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ClassRange</span>::<span class="ident">one</span>(<span class="string">&#39;-&#39;</span>));
        }
        <span class="kw">loop</span> {
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
                <span class="comment">// e.g., [a</span>
                <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>));
            }
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur</span>() {
                <span class="comment">// If no ranges have been added, then `]` is the first</span>
                <span class="comment">// character (sans, perhaps, the `^` symbol), so it should</span>
                <span class="comment">// be interpreted as a `]` instead of a closing class bracket.</span>
                <span class="string">&#39;]&#39;</span> <span class="kw">if</span> <span class="ident">class</span>.<span class="ident">len</span>() <span class="op">&gt;</span> <span class="number">0</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">bump</span>(); <span class="kw">break</span> }
                <span class="string">&#39;[&#39;</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">maybe_parse_ascii</span>() {
                    <span class="prelude-val">Some</span>(<span class="ident">class2</span>) <span class="op">=&gt;</span> <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">extend</span>(<span class="ident">class2</span>),
                    <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                        <span class="self">self</span>.<span class="ident">bump</span>();
                        <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_class_range</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">class</span>, <span class="string">&#39;[&#39;</span>))
                    }
                },
                <span class="string">&#39;\\&#39;</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_escape</span>()) {
                    <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class2</span>)) <span class="op">=&gt;</span> {
                        <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">extend</span>(<span class="ident">class2</span>);
                    }
                    <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class2</span>)) <span class="op">=&gt;</span> {
                        <span class="kw">for</span> <span class="ident">byte_range</span> <span class="kw">in</span> <span class="ident">class2</span> {
                            <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">byte_range</span>.<span class="ident">start</span> <span class="kw">as</span> <span class="ident">char</span>;
                            <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">byte_range</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">char</span>;
                            <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ClassRange</span>::<span class="ident">new</span>(<span class="ident">s</span>, <span class="ident">e</span>));
                        }
                    }
                    <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>, .. }) <span class="op">=&gt;</span> {
                        <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_class_range</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">class</span>, <span class="ident">chars</span>[<span class="number">0</span>]));
                    }
                    <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">LiteralBytes</span> { <span class="ident">bytes</span>, .. }) <span class="op">=&gt;</span> {
                        <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">bytes</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">char</span>;
                        <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_class_range</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">class</span>, <span class="ident">start</span>));
                    }
                    <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> {
                        <span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">ErrorKind</span>::<span class="ident">InvalidClassEscape</span>(<span class="ident">e</span>);
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">err</span>));
                    }
                    <span class="comment">// Because `parse_escape` can never return `LeftParen`.</span>
                    _ <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
                },
                <span class="ident">start</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                        <span class="kw">let</span> _ <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">codepoint_to_one_byte</span>(<span class="ident">start</span>));
                    }
                    <span class="self">self</span>.<span class="ident">bump</span>();
                    <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_class_range</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">class</span>, <span class="ident">start</span>));
                }
            }
        }
        <span class="ident">class</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">class_transform</span>(<span class="ident">negated</span>, <span class="ident">class</span>).<span class="ident">canonicalize</span>();
        <span class="kw">if</span> <span class="ident">class</span>.<span class="ident">is_empty</span>() {
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyClass</span>));
        }
        <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
            <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>)
        } <span class="kw">else</span> {
            <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class</span>.<span class="ident">to_byte_class</span>())
        }))
    }

    <span class="comment">// Parses a single range in a character class.</span>
    <span class="comment">//</span>
    <span class="comment">// Since this is a helper for `parse_class`, its signature sticks out.</span>
    <span class="comment">// Namely, it requires the start character of the range and the char</span>
    <span class="comment">// class to mutate.</span>
    <span class="comment">//</span>
    <span class="comment">// e.g., `[a-z]`</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `-` (with start == `a`)</span>
    <span class="comment">// End:   `]`</span>
    <span class="kw">fn</span> <span class="ident">parse_class_range</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">class</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">CharClass</span>, <span class="ident">start</span>: <span class="ident">char</span>)
                        <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;-&#39;</span>) {
            <span class="comment">// Not a range, so just push a singleton range.</span>
            <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ClassRange</span>::<span class="ident">one</span>(<span class="ident">start</span>));
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(());
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
            <span class="comment">// e.g., [a-</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>));
        }
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">peek_is</span>(<span class="string">&#39;]&#39;</span>) {
            <span class="comment">// This is the end of the class, so we permit use of `-` as a</span>
            <span class="comment">// regular char (just like we do in the beginning).</span>
            <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ClassRange</span>::<span class="ident">one</span>(<span class="ident">start</span>));
            <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ClassRange</span>::<span class="ident">one</span>(<span class="string">&#39;-&#39;</span>));
            <span class="kw">return</span> <span class="prelude-val">Ok</span>(());
        }

        <span class="comment">// We have a real range. Just need to check to parse literal and</span>
        <span class="comment">// make sure it&#39;s a valid range.</span>
        <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">cur</span>() {
            <span class="string">&#39;\\&#39;</span> <span class="op">=&gt;</span> <span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">parse_escape</span>()) {
                <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>, .. }) <span class="op">=&gt;</span> {
                    <span class="ident">chars</span>[<span class="number">0</span>]
                }
                <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">LiteralBytes</span> { <span class="ident">bytes</span>, .. }) <span class="op">=&gt;</span> {
                    <span class="ident">bytes</span>[<span class="number">0</span>] <span class="kw">as</span> <span class="ident">char</span>
                }
                <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> {
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidClassEscape</span>(<span class="ident">e</span>)));
                }
                <span class="comment">// Because `parse_escape` can never return `LeftParen`.</span>
                _ <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
            },
            _ <span class="op">=&gt;</span> {
                <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump</span>();
                <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                    <span class="kw">let</span> _ <span class="op">=</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">codepoint_to_one_byte</span>(<span class="ident">c</span>));
                }
                <span class="ident">c</span>
            }
        };
        <span class="kw">if</span> <span class="ident">end</span> <span class="op">&lt;</span> <span class="ident">start</span> {
            <span class="comment">// e.g., [z-a]</span>
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidClassRange</span> {
                <span class="ident">start</span>: <span class="ident">start</span>,
                <span class="ident">end</span>: <span class="ident">end</span>,
            }));
        }
        <span class="ident">class</span>.<span class="ident">ranges</span>.<span class="ident">push</span>(<span class="ident">ClassRange</span>::<span class="ident">new</span>(<span class="ident">start</span>, <span class="ident">end</span>));
        <span class="prelude-val">Ok</span>(())
    }

    <span class="comment">// Parses an ASCII class, e.g., `[:alnum:]+`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `[`</span>
    <span class="comment">// End:   `+`</span>
    <span class="comment">//</span>
    <span class="comment">// Also supports negation, e.g., `[:^alnum:]`.</span>
    <span class="comment">//</span>
    <span class="comment">// This parsing routine is distinct from the others in that it doesn&#39;t</span>
    <span class="comment">// actually report any errors. Namely, if it fails, then the parser should</span>
    <span class="comment">// fall back to parsing a regular class.</span>
    <span class="comment">//</span>
    <span class="comment">// This method will only make progress in the parser if it succeeds.</span>
    <span class="comment">// Otherwise, the input remains where it started.</span>
    <span class="kw">fn</span> <span class="ident">maybe_parse_ascii</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CharClass</span><span class="op">&gt;</span> {
        <span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">p</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Parser</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CharClass</span><span class="op">&gt;</span> {
            <span class="ident">p</span>.<span class="ident">bump</span>(); <span class="comment">// the `[`</span>
            <span class="kw">if</span> <span class="op">!</span><span class="ident">p</span>.<span class="ident">bump_if</span>(<span class="string">&#39;:&#39;</span>) { <span class="kw">return</span> <span class="prelude-val">None</span>; }
            <span class="kw">let</span> <span class="ident">negate</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">bump_if</span>(<span class="string">&#39;^&#39;</span>);
            <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">p</span>.<span class="ident">bump_get</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;:&#39;</span>) {
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">None</span>,
                <span class="prelude-val">Some</span>(<span class="ident">name</span>) <span class="op">=&gt;</span> <span class="ident">name</span>,
            };
            <span class="kw">if</span> <span class="op">!</span><span class="ident">p</span>.<span class="ident">bump_if</span>(<span class="string">&quot;:]&quot;</span>) { <span class="kw">return</span> <span class="prelude-val">None</span>; }
            <span class="ident">ascii_class</span>(<span class="kw-2">&amp;</span><span class="ident">name</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">cls</span><span class="op">|</span> <span class="ident">p</span>.<span class="ident">class_transform</span>(<span class="ident">negate</span>, <span class="ident">cls</span>))
        }
        <span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chari</span>;
        <span class="kw">match</span> <span class="ident">parse</span>(<span class="self">self</span>) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> { <span class="self">self</span>.<span class="ident">chari</span> <span class="op">=</span> <span class="ident">start</span>; <span class="prelude-val">None</span> }
            <span class="ident">result</span> <span class="op">=&gt;</span> <span class="ident">result</span>,
        }
    }

    <span class="comment">// Parses a Uncode class name, e.g., `a\pLb`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `L`</span>
    <span class="comment">// End:   `b`</span>
    <span class="comment">//</span>
    <span class="comment">// And also, `a\p{Greek}b`.</span>
    <span class="comment">//</span>
    <span class="comment">// Start: `{`</span>
    <span class="comment">// End:   `b`</span>
    <span class="comment">//</span>
    <span class="comment">// `negate` is true when the class name is used with `\P`.</span>
    <span class="kw">fn</span> <span class="ident">parse_unicode_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">neg</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">CharClass</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">name</span> <span class="op">=</span>
            <span class="kw">if</span> <span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;{&#39;</span>) {
                <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">bump_get</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;}&#39;</span>).<span class="ident">unwrap_or</span>(<span class="string">&quot;&quot;</span>.<span class="ident">into</span>());
                <span class="kw">if</span> <span class="ident">n</span>.<span class="ident">is_empty</span>() <span class="op">||</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">bump_if</span>(<span class="string">&#39;}&#39;</span>) {
                    <span class="comment">// e.g., \p{Greek</span>
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnclosedUnicodeName</span>));
                }
                <span class="ident">n</span>
            } <span class="kw">else</span> {
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">eof</span>() {
                    <span class="comment">// e.g., \p</span>
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnexpectedEscapeEof</span>));
                }
                <span class="self">self</span>.<span class="ident">bump</span>().<span class="ident">to_string</span>()
            };
        <span class="kw">match</span> <span class="ident">unicode_class</span>(<span class="kw-2">&amp;</span><span class="ident">name</span>) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedUnicodeClass</span>(<span class="ident">name</span>))),
            <span class="prelude-val">Some</span>(<span class="ident">cls</span>) <span class="op">=&gt;</span> {
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
                    <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">class_transform</span>(<span class="ident">neg</span>, <span class="ident">cls</span>))
                } <span class="kw">else</span> {
                    <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>))
                }
            }
        }
    }

    <span class="comment">// Parses a perl character class with Unicode support.</span>
    <span class="comment">//</span>
    <span class="comment">// `name` must be one of d, s, w, D, S, W. If not, this function panics.</span>
    <span class="comment">//</span>
    <span class="comment">// No parser state is changed.</span>
    <span class="kw">fn</span> <span class="ident">parse_perl_class</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">name</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="kw">use</span> <span class="ident">unicode</span>::<span class="ident">regex</span>::{<span class="ident">PERLD</span>, <span class="ident">PERLS</span>, <span class="ident">PERLW</span>};
        <span class="kw">let</span> (<span class="ident">cls</span>, <span class="ident">negate</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span>, <span class="ident">name</span>) {
            (<span class="bool-val">true</span>, <span class="string">&#39;d&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">raw_class_to_expr</span>(<span class="ident">PERLD</span>), <span class="bool-val">false</span>),
            (<span class="bool-val">true</span>, <span class="string">&#39;D&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">raw_class_to_expr</span>(<span class="ident">PERLD</span>), <span class="bool-val">true</span>),
            (<span class="bool-val">true</span>, <span class="string">&#39;s&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">raw_class_to_expr</span>(<span class="ident">PERLS</span>), <span class="bool-val">false</span>),
            (<span class="bool-val">true</span>, <span class="string">&#39;S&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">raw_class_to_expr</span>(<span class="ident">PERLS</span>), <span class="bool-val">true</span>),
            (<span class="bool-val">true</span>, <span class="string">&#39;w&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">raw_class_to_expr</span>(<span class="ident">PERLW</span>), <span class="bool-val">false</span>),
            (<span class="bool-val">true</span>, <span class="string">&#39;W&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">raw_class_to_expr</span>(<span class="ident">PERLW</span>), <span class="bool-val">true</span>),
            (<span class="bool-val">false</span>, <span class="string">&#39;d&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">ascii_class</span>(<span class="string">&quot;digit&quot;</span>).<span class="ident">unwrap</span>(), <span class="bool-val">false</span>),
            (<span class="bool-val">false</span>, <span class="string">&#39;D&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">ascii_class</span>(<span class="string">&quot;digit&quot;</span>).<span class="ident">unwrap</span>(), <span class="bool-val">true</span>),
            (<span class="bool-val">false</span>, <span class="string">&#39;s&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">ascii_class</span>(<span class="string">&quot;space&quot;</span>).<span class="ident">unwrap</span>(), <span class="bool-val">false</span>),
            (<span class="bool-val">false</span>, <span class="string">&#39;S&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">ascii_class</span>(<span class="string">&quot;space&quot;</span>).<span class="ident">unwrap</span>(), <span class="bool-val">true</span>),
            (<span class="bool-val">false</span>, <span class="string">&#39;w&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">ascii_class</span>(<span class="string">&quot;word&quot;</span>).<span class="ident">unwrap</span>(), <span class="bool-val">false</span>),
            (<span class="bool-val">false</span>, <span class="string">&#39;W&#39;</span>) <span class="op">=&gt;</span> (<span class="ident">ascii_class</span>(<span class="string">&quot;word&quot;</span>).<span class="ident">unwrap</span>(), <span class="bool-val">true</span>),
            _ <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
        };
        <span class="self">self</span>.<span class="ident">class_transform</span>(<span class="ident">negate</span>, <span class="ident">cls</span>)
    }

    <span class="comment">// Always bump to the next input and return the given expression as a</span>
    <span class="comment">// `Build`.</span>
    <span class="comment">//</span>
    <span class="comment">// This is mostly for convenience when the surrounding context implies</span>
    <span class="comment">// that the next character corresponds to the given expression.</span>
    <span class="kw">fn</span> <span class="ident">parse_one</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">e</span>: <span class="ident">Expr</span>) <span class="op">-&gt;</span> <span class="ident">Build</span> {
        <span class="self">self</span>.<span class="ident">bump</span>();
        <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>)
    }
}

<span class="comment">// Auxiliary helper methods.</span>
<span class="kw">impl</span> <span class="ident">Parser</span> {
    <span class="kw">fn</span> <span class="ident">chars</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Chars</span> {
        <span class="ident">Chars</span>::<span class="ident">new</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">chars</span>[<span class="self">self</span>.<span class="ident">chari</span>..], <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">ignore_space</span>)
    }

    <span class="kw">fn</span> <span class="ident">bump</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">char</span> {
        <span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cur</span>();
        <span class="self">self</span>.<span class="ident">chari</span> <span class="op">=</span> <span class="ident">checkadd</span>(<span class="self">self</span>.<span class="ident">chari</span>, <span class="self">self</span>.<span class="ident">chars</span>().<span class="ident">next_count</span>());
        <span class="ident">c</span>
    }

    <span class="kw">fn</span> <span class="ident">cur</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">char</span> { <span class="self">self</span>.<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>() }

    <span class="kw">fn</span> <span class="ident">eof</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">is_none</span>() }

    <span class="kw">fn</span> <span class="ident">bump_get</span><span class="op">&lt;</span><span class="ident">B</span>: <span class="ident">Bumpable</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="ident">B</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">match_end</span>(<span class="self">self</span>);
        <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="prelude-val">None</span>
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="ident">checkadd</span>(<span class="self">self</span>.<span class="ident">chari</span>, <span class="ident">n</span>);
            <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chars</span>[<span class="self">self</span>.<span class="ident">chari</span>..<span class="ident">end</span>]
                        .<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>();
            <span class="self">self</span>.<span class="ident">chari</span> <span class="op">=</span> <span class="ident">end</span>;
            <span class="prelude-val">Some</span>(<span class="ident">s</span>)
        }
    }

    <span class="kw">fn</span> <span class="ident">bump_if</span><span class="op">&lt;</span><span class="ident">B</span>: <span class="ident">Bumpable</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="ident">B</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">match_end</span>(<span class="self">self</span>);
        <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> {
            <span class="bool-val">false</span>
        } <span class="kw">else</span> {
            <span class="self">self</span>.<span class="ident">chari</span> <span class="op">=</span> <span class="ident">checkadd</span>(<span class="self">self</span>.<span class="ident">chari</span>, <span class="ident">n</span>);
            <span class="bool-val">true</span>
        }
    }

    <span class="kw">fn</span> <span class="ident">peek_is</span><span class="op">&lt;</span><span class="ident">B</span>: <span class="ident">Bumpable</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">s</span>: <span class="ident">B</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="ident">s</span>.<span class="ident">match_end</span>(<span class="self">self</span>) <span class="op">&gt;</span> <span class="number">0</span>
    }

    <span class="kw">fn</span> <span class="ident">err</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">kind</span>: <span class="ident">ErrorKind</span>) <span class="op">-&gt;</span> <span class="ident">Error</span> {
        <span class="self">self</span>.<span class="ident">errat</span>(<span class="self">self</span>.<span class="ident">chari</span>, <span class="ident">kind</span>)
    }

    <span class="kw">fn</span> <span class="ident">errat</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pos</span>: <span class="ident">usize</span>, <span class="ident">kind</span>: <span class="ident">ErrorKind</span>) <span class="op">-&gt;</span> <span class="ident">Error</span> {
        <span class="ident">Error</span> { <span class="ident">pos</span>: <span class="ident">pos</span>, <span class="ident">surround</span>: <span class="self">self</span>.<span class="ident">windowat</span>(<span class="ident">pos</span>), <span class="ident">kind</span>: <span class="ident">kind</span> }
    }

    <span class="kw">fn</span> <span class="ident">windowat</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pos</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">String</span> {
        <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">max</span>(<span class="number">5</span>, <span class="ident">pos</span>) <span class="op">-</span> <span class="number">5</span>;
        <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">min</span>(<span class="self">self</span>.<span class="ident">chars</span>.<span class="ident">len</span>(), <span class="ident">checkadd</span>(<span class="ident">pos</span>, <span class="number">5</span>));
        <span class="self">self</span>.<span class="ident">chars</span>[<span class="ident">s</span>..<span class="ident">e</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>()
    }

    <span class="kw">fn</span> <span class="ident">pop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">expected</span>: <span class="ident">ErrorKind</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Expr</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
            <span class="prelude-val">None</span> <span class="op">|</span> <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span>{..}) <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">expected</span>)),
            <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">e</span>),
        }
    }

    <span class="comment">// If the current context calls for case insensitivity, then apply</span>
    <span class="comment">// case folding. Similarly, if `negate` is `true`, then negate the</span>
    <span class="comment">// class. (Negation always proceeds case folding.)</span>
    <span class="kw">fn</span> <span class="ident">class_transform</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">negate</span>: <span class="ident">bool</span>, <span class="kw-2">mut</span> <span class="ident">cls</span>: <span class="ident">CharClass</span>) <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">casei</span> {
            <span class="ident">cls</span> <span class="op">=</span> <span class="ident">cls</span>.<span class="ident">case_fold</span>();
        }
        <span class="kw">if</span> <span class="ident">negate</span> {
            <span class="ident">cls</span> <span class="op">=</span> <span class="ident">cls</span>.<span class="ident">negate</span>();
        }
        <span class="ident">cls</span>
    }

    <span class="comment">// Translates a Unicode codepoint into a single UTF-8 byte, and returns an</span>
    <span class="comment">// error if it&#39;s not possible.</span>
    <span class="comment">//</span>
    <span class="comment">// This will panic if self.flags.unicode == true.</span>
    <span class="kw">fn</span> <span class="ident">codepoint_to_one_byte</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">u8</span><span class="op">&gt;</span> {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span>);
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">to_string</span>().<span class="ident">as_bytes</span>().<span class="ident">to_owned</span>();
        <span class="kw">if</span> <span class="ident">bytes</span>.<span class="ident">len</span>() <span class="op">&gt;</span> <span class="number">1</span> {
            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>));
        }
        <span class="prelude-val">Ok</span>(<span class="ident">bytes</span>[<span class="number">0</span>])
    }

    <span class="comment">// Creates a new byte literal from a single byte.</span>
    <span class="comment">//</span>
    <span class="comment">// If the given number can&#39;t fit into a single byte, then it is assumed</span>
    <span class="comment">// to be a Unicode codepoint and an error is returned.</span>
    <span class="comment">//</span>
    <span class="comment">// This should only be called when the bytes flag is enabled.</span>
    <span class="kw">fn</span> <span class="ident">u32_to_one_byte</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">b</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span>);
        <span class="kw">if</span> <span class="ident">b</span> <span class="op">&gt;</span> <span class="ident">u8</span>::<span class="ident">MAX</span> <span class="kw">as</span> <span class="ident">u32</span> {
            <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>))
        } <span class="kw">else</span> <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">allow_bytes</span> <span class="op">&amp;&amp;</span> <span class="ident">b</span> <span class="op">&gt;</span> <span class="number">0x7F</span> {
            <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>))
        } <span class="kw">else</span> {
            <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">LiteralBytes</span> {
                <span class="ident">bytes</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">b</span> <span class="kw">as</span> <span class="ident">u8</span>],
                <span class="ident">casei</span>: <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">casei</span>,
            }))
        }
    }

    <span class="comment">// Creates a new literal expr from a Unicode codepoint.</span>
    <span class="comment">//</span>
    <span class="comment">// Creates a byte literal if the `bytes` flag is set.</span>
    <span class="kw">fn</span> <span class="ident">lit</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">unicode</span> {
            <span class="ident">Expr</span>::<span class="ident">Literal</span> {
                <span class="ident">chars</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">c</span>],
                <span class="ident">casei</span>: <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">casei</span>,
            }
        } <span class="kw">else</span> {
            <span class="ident">Expr</span>::<span class="ident">LiteralBytes</span> {
                <span class="ident">bytes</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">codepoint_to_one_byte</span>(<span class="ident">c</span>))],
                <span class="ident">casei</span>: <span class="self">self</span>.<span class="ident">flags</span>.<span class="ident">casei</span>,
            }
        }))
    }
}

<span class="kw">struct</span> <span class="ident">Chars</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="ident">chars</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">char</span>],
    <span class="ident">cur</span>: <span class="ident">usize</span>,
    <span class="ident">ignore_space</span>: <span class="ident">bool</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Chars</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">char</span>;
    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">ignore_space</span> {
            <span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>();
            <span class="self">self</span>.<span class="ident">advance</span>();
            <span class="kw">return</span> <span class="ident">x</span>;
        }
        <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">c</span>() {
            <span class="self">self</span>.<span class="ident">advance</span>();
            <span class="kw">match</span> <span class="ident">c</span> {
                <span class="string">&#39;\\&#39;</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">c</span>() {
                            <span class="prelude-val">Some</span>(<span class="string">&#39;#&#39;</span>) <span class="op">=&gt;</span> {<span class="self">self</span>.<span class="ident">advance</span>(); <span class="prelude-val">Some</span>(<span class="string">&#39;#&#39;</span>)}
                            _ <span class="op">=&gt;</span> <span class="prelude-val">Some</span>(<span class="string">&#39;\\&#39;</span>)
                        },
                <span class="string">&#39;#&#39;</span>  <span class="op">=&gt;</span> <span class="kw">loop</span> {
                            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">c</span>() {
                                <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=&gt;</span> {
                                    <span class="self">self</span>.<span class="ident">advance</span>();
                                    <span class="kw">if</span> <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;\n&#39;</span> {
                                        <span class="kw">break</span>;
                                    }
                                },
                                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">None</span>
                            }
                        },
                _    <span class="op">=&gt;</span> <span class="kw">if</span> <span class="op">!</span><span class="ident">c</span>.<span class="ident">is_whitespace</span>() {<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>);}
            }
        }
        <span class="prelude-val">None</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Chars</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">chars</span>: <span class="kw-2">&amp;</span>[<span class="ident">char</span>], <span class="ident">ignore_space</span>: <span class="ident">bool</span>) <span class="op">-&gt;</span> <span class="ident">Chars</span> {
        <span class="ident">Chars</span> {
            <span class="ident">chars</span>: <span class="ident">chars</span>,
            <span class="ident">cur</span>: <span class="number">0</span>,
            <span class="ident">ignore_space</span>: <span class="ident">ignore_space</span>,
        }
    }

    <span class="kw">fn</span> <span class="ident">c</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">chars</span>.<span class="ident">get</span>(<span class="self">self</span>.<span class="ident">cur</span>).<span class="ident">map</span>(<span class="op">|</span><span class="kw-2">&amp;</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>)
    }

    <span class="kw">fn</span> <span class="ident">advance</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">cur</span> <span class="op">=</span> <span class="ident">checkadd</span>(<span class="self">self</span>.<span class="ident">cur</span>, <span class="number">1</span>);
    }

    <span class="kw">fn</span> <span class="ident">next_count</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">next</span>();
        <span class="self">self</span>.<span class="ident">cur</span>
    }
}

<span class="comment">// Auxiliary methods for manipulating the expression stack.</span>
<span class="kw">impl</span> <span class="ident">Parser</span> {
    <span class="comment">// Called whenever an alternate (`|`) is found.</span>
    <span class="comment">//</span>
    <span class="comment">// This pops the expression stack until:</span>
    <span class="comment">//</span>
    <span class="comment">//  1. The stack is empty. Pushes an alternation with one arm.</span>
    <span class="comment">//  2. An opening parenthesis is found. Leave the parenthesis</span>
    <span class="comment">//     on the stack and push an alternation with one arm.</span>
    <span class="comment">//  3. An alternate (`|`) is found. Pop the existing alternation,</span>
    <span class="comment">//     add an arm and push the modified alternation.</span>
    <span class="comment">//</span>
    <span class="comment">// Each &quot;arm&quot; in the above corresponds to the concatenation of all</span>
    <span class="comment">// popped expressions.</span>
    <span class="comment">//</span>
    <span class="comment">// In the first two cases, the stack is left in an invalid state</span>
    <span class="comment">// because an alternation with one arm is not allowed. This</span>
    <span class="comment">// particular state will be detected by `finish_concat` and an</span>
    <span class="comment">// error will be reported.</span>
    <span class="comment">//</span>
    <span class="comment">// In none of the cases is an empty arm allowed. If an empty arm</span>
    <span class="comment">// is found, an error is reported.</span>
    <span class="kw">fn</span> <span class="ident">alternate</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Build</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">concat</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
        <span class="kw">let</span> <span class="ident">alts</span> <span class="op">=</span> <span class="op">|</span><span class="ident">es</span><span class="op">|</span> <span class="prelude-val">Ok</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="ident">es</span>)));
        <span class="kw">loop</span> {
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">concat</span>.<span class="ident">is_empty</span>() {
                        <span class="comment">// e.g., |a</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>));
                    }
                    <span class="kw">return</span> <span class="ident">alts</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">rev_concat</span>(<span class="ident">concat</span>)]);
                }
                <span class="prelude-val">Some</span>(<span class="ident">e</span> @ <span class="ident">Build</span>::<span class="ident">LeftParen</span>{..}) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">concat</span>.<span class="ident">is_empty</span>() {
                        <span class="comment">// e.g., (|a)</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>));
                    }
                    <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">push</span>(<span class="ident">e</span>);
                    <span class="kw">return</span> <span class="ident">alts</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">rev_concat</span>(<span class="ident">concat</span>)]);
                }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="kw-2">mut</span> <span class="ident">es</span>))) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">concat</span>.<span class="ident">is_empty</span>() {
                        <span class="comment">// e.g., a||</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>));
                    }
                    <span class="ident">es</span>.<span class="ident">push</span>(<span class="ident">rev_concat</span>(<span class="ident">concat</span>));
                    <span class="kw">return</span> <span class="ident">alts</span>(<span class="ident">es</span>);
                }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> { <span class="ident">concat</span>.<span class="ident">push</span>(<span class="ident">e</span>); }
            }
        }
    }

    <span class="comment">// Called whenever a closing parenthesis (`)`) is found.</span>
    <span class="comment">//</span>
    <span class="comment">// This pops the expression stack until:</span>
    <span class="comment">//</span>
    <span class="comment">//  1. The stack is empty. An error is reported because this</span>
    <span class="comment">//     indicates an unopened parenthesis.</span>
    <span class="comment">//  2. An opening parenthesis is found. Pop the opening parenthesis</span>
    <span class="comment">//     and push a `Group` expression.</span>
    <span class="comment">//  3. An alternate (`|`) is found. Pop the existing alternation</span>
    <span class="comment">//     and an arm to it in place. Pop one more item from the stack.</span>
    <span class="comment">//     If the stack was empty, then report an unopened parenthesis</span>
    <span class="comment">//     error, otherwise assume it is an opening parenthesis and</span>
    <span class="comment">//     push a `Group` expression with the popped alternation.</span>
    <span class="comment">//     (We can assume this is an opening parenthesis because an</span>
    <span class="comment">//     alternation either corresponds to the entire Regex or it</span>
    <span class="comment">//     corresponds to an entire group. This is guaranteed by the</span>
    <span class="comment">//     `alternate` method.)</span>
    <span class="comment">//</span>
    <span class="comment">// Each &quot;arm&quot; in the above corresponds to the concatenation of all</span>
    <span class="comment">// popped expressions.</span>
    <span class="comment">//</span>
    <span class="comment">// Empty arms nor empty groups are allowed.</span>
    <span class="kw">fn</span> <span class="ident">close_paren</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span>(<span class="ident">Flags</span>, <span class="ident">Build</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">concat</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
        <span class="kw">loop</span> {
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
                <span class="comment">// e.g., )</span>
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnopenedParen</span>)),
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span> { <span class="ident">i</span>, <span class="ident">name</span>, <span class="ident">old_flags</span>, .. }) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">concat</span>.<span class="ident">is_empty</span>() {
                        <span class="comment">// e.g., ()</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyGroup</span>));
                    }
                    <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">old_flags</span>, <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Group</span> {
                        <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">rev_concat</span>(<span class="ident">concat</span>)),
                        <span class="ident">i</span>: <span class="ident">i</span>,
                        <span class="ident">name</span>: <span class="ident">name</span>,
                    })));
                }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="kw-2">mut</span> <span class="ident">es</span>))) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">concat</span>.<span class="ident">is_empty</span>() {
                        <span class="comment">// e.g., (a|)</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>));
                    }
                    <span class="ident">es</span>.<span class="ident">push</span>(<span class="ident">rev_concat</span>(<span class="ident">concat</span>));
                    <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
                        <span class="comment">// e.g., a|b)</span>
                        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">UnopenedParen</span>)),
                        <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(_)) <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(),
                        <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span> { <span class="ident">i</span>, <span class="ident">name</span>, <span class="ident">old_flags</span>, .. }) <span class="op">=&gt;</span> {
                            <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">old_flags</span>, <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Group</span> {
                                <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="ident">es</span>)),
                                <span class="ident">i</span>: <span class="ident">i</span>,
                                <span class="ident">name</span>: <span class="ident">name</span>,
                            })));
                        }
                    }
                }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> { <span class="ident">concat</span>.<span class="ident">push</span>(<span class="ident">e</span>); }
            }
        }
    }

    <span class="comment">// Called only when the parser reaches the end of input.</span>
    <span class="comment">//</span>
    <span class="comment">// This pops the expression stack until:</span>
    <span class="comment">//</span>
    <span class="comment">//  1. The stack is empty. Return concatenation of popped</span>
    <span class="comment">//     expressions. This concatenation may be empty!</span>
    <span class="comment">//  2. An alternation is found. Pop the alternation and push</span>
    <span class="comment">//     a new arm. Return the alternation as the entire Regex.</span>
    <span class="comment">//     After this, the stack must be empty, or else there is</span>
    <span class="comment">//     an unclosed paren.</span>
    <span class="comment">//</span>
    <span class="comment">// If an opening parenthesis is popped, then an error is</span>
    <span class="comment">// returned since it indicates an unclosed parenthesis.</span>
    <span class="kw">fn</span> <span class="ident">finish_concat</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Expr</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">concat</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
        <span class="kw">loop</span> {
            <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
                <span class="prelude-val">None</span> <span class="op">=&gt;</span> { <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">rev_concat</span>(<span class="ident">concat</span>)); }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span>{ <span class="ident">chari</span>, ..}) <span class="op">=&gt;</span> {
                    <span class="comment">// e.g., a(b</span>
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">errat</span>(<span class="ident">chari</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedParen</span>));
                }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="kw-2">mut</span> <span class="ident">es</span>))) <span class="op">=&gt;</span> {
                    <span class="kw">if</span> <span class="ident">concat</span>.<span class="ident">is_empty</span>() {
                        <span class="comment">// e.g., a|</span>
                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">err</span>(<span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>));
                    }
                    <span class="ident">es</span>.<span class="ident">push</span>(<span class="ident">rev_concat</span>(<span class="ident">concat</span>));
                    <span class="comment">// Make sure there are no opening parens remaining.</span>
                    <span class="kw">match</span> <span class="self">self</span>.<span class="ident">stack</span>.<span class="ident">pop</span>() {
                        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="ident">es</span>)),
                        <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">LeftParen</span>{ <span class="ident">chari</span>, ..}) <span class="op">=&gt;</span> {
                            <span class="comment">// e.g., (a|b</span>
                            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="self">self</span>.<span class="ident">errat</span>(
                                <span class="ident">chari</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedParen</span>));
                        }
                        <span class="ident">e</span> <span class="op">=&gt;</span> <span class="macro">unreachable</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">e</span>),
                    }
                }
                <span class="prelude-val">Some</span>(<span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> { <span class="ident">concat</span>.<span class="ident">push</span>(<span class="ident">e</span>); }
            }
        }
    }
}

<span class="kw">impl</span> <span class="ident">Build</span> {
    <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">Build</span>::<span class="ident">Expr</span>(<span class="ident">Expr</span>::<span class="ident">Empty</span>) <span class="op">=&gt;</span> <span class="bool-val">true</span>,
            _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
        }
    }
}

<span class="comment">// Make it ergonomic to conditionally bump the parser.</span>
<span class="comment">// i.e., `bump_if(&#39;a&#39;)` or `bump_if(&quot;abc&quot;)`.</span>
<span class="kw">trait</span> <span class="ident">Bumpable</span> {
    <span class="kw">fn</span> <span class="ident">match_end</span>(<span class="self">self</span>, <span class="ident">p</span>: <span class="kw-2">&amp;</span><span class="ident">Parser</span>) <span class="op">-&gt;</span> <span class="ident">usize</span>;
}

<span class="kw">impl</span> <span class="ident">Bumpable</span> <span class="kw">for</span> <span class="ident">char</span> {
    <span class="kw">fn</span> <span class="ident">match_end</span>(<span class="self">self</span>, <span class="ident">p</span>: <span class="kw-2">&amp;</span><span class="ident">Parser</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">chars</span>();
        <span class="kw">if</span> <span class="ident">chars</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">==</span> <span class="self">self</span>).<span class="ident">unwrap_or</span>(<span class="bool-val">false</span>) {
            <span class="ident">chars</span>.<span class="ident">cur</span>
        } <span class="kw">else</span> {
            <span class="number">0</span>
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Bumpable</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">str</span> {
    <span class="kw">fn</span> <span class="ident">match_end</span>(<span class="self">self</span>, <span class="ident">p</span>: <span class="kw-2">&amp;</span><span class="ident">Parser</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">search</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">chars</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rest</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">chars</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">loop</span> {
            <span class="kw">match</span> (<span class="ident">rest</span>.<span class="ident">next</span>(), <span class="ident">search</span>.<span class="ident">next</span>()) {
                (<span class="prelude-val">Some</span>(<span class="ident">c1</span>), <span class="prelude-val">Some</span>(<span class="ident">c2</span>)) <span class="kw">if</span> <span class="ident">c1</span> <span class="op">==</span> <span class="ident">c2</span> <span class="op">=&gt;</span> <span class="ident">count</span> <span class="op">=</span> <span class="ident">rest</span>.<span class="ident">cur</span>,
                (_, <span class="prelude-val">None</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="ident">count</span>,
                _ <span class="op">=&gt;</span> <span class="kw">return</span> <span class="number">0</span>,
            }
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">bool</span><span class="op">&gt;</span> <span class="ident">Bumpable</span> <span class="kw">for</span> <span class="ident">F</span> {
    <span class="kw">fn</span> <span class="ident">match_end</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">p</span>: <span class="kw-2">&amp;</span><span class="ident">Parser</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chars</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">chars</span>();
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">c</span>) <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">next</span>() {
            <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>(<span class="ident">c</span>) {
                <span class="kw">break</span>
            }
            <span class="ident">count</span> <span class="op">=</span> <span class="ident">chars</span>.<span class="ident">cur</span>;
        }
        <span class="ident">count</span>
    }
}

<span class="comment">// Turn a sequence of expressions into a concatenation.</span>
<span class="comment">// This only uses `Concat` if there are 2 or more expressions.</span>
<span class="kw">fn</span> <span class="ident">rev_concat</span>(<span class="kw-2">mut</span> <span class="ident">exprs</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Expr</span><span class="op">&gt;</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> {
    <span class="kw">if</span> <span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> {
        <span class="ident">Expr</span>::<span class="ident">Empty</span>
    } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">exprs</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> {
        <span class="ident">exprs</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>()
    } <span class="kw">else</span> {
        <span class="ident">exprs</span>.<span class="ident">reverse</span>();
        <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="ident">exprs</span>)
    }
}

<span class="comment">// Returns true if and only if the given character is allowed in a capture</span>
<span class="comment">// name. Note that the first char of a capture name must not be numeric.</span>
<span class="kw">fn</span> <span class="ident">is_valid_capture_char</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="ident">c</span> <span class="op">==</span> <span class="string">&#39;_&#39;</span> <span class="op">||</span> (<span class="ident">c</span> <span class="op">&gt;=</span> <span class="string">&#39;0&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">&#39;9&#39;</span>)
    <span class="op">||</span> (<span class="ident">c</span> <span class="op">&gt;=</span> <span class="string">&#39;a&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">&#39;z&#39;</span>) <span class="op">||</span> (<span class="ident">c</span> <span class="op">&gt;=</span> <span class="string">&#39;A&#39;</span> <span class="op">&amp;&amp;</span> <span class="ident">c</span> <span class="op">&lt;=</span> <span class="string">&#39;Z&#39;</span>)
}

<span class="doccomment">/// Returns true if the give character has significance in a regex.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_punct</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
    <span class="kw">match</span> <span class="ident">c</span> {
        <span class="string">&#39;\\&#39;</span> <span class="op">|</span> <span class="string">&#39;.&#39;</span> <span class="op">|</span> <span class="string">&#39;+&#39;</span> <span class="op">|</span> <span class="string">&#39;*&#39;</span> <span class="op">|</span> <span class="string">&#39;?&#39;</span> <span class="op">|</span> <span class="string">&#39;(&#39;</span> <span class="op">|</span> <span class="string">&#39;)&#39;</span> <span class="op">|</span> <span class="string">&#39;|&#39;</span> <span class="op">|</span>
        <span class="string">&#39;[&#39;</span> <span class="op">|</span> <span class="string">&#39;]&#39;</span> <span class="op">|</span> <span class="string">&#39;{&#39;</span> <span class="op">|</span> <span class="string">&#39;}&#39;</span> <span class="op">|</span> <span class="string">&#39;^&#39;</span> <span class="op">|</span> <span class="string">&#39;$&#39;</span> <span class="op">|</span> <span class="string">&#39;#&#39;</span> <span class="op">=&gt;</span> <span class="bool-val">true</span>,
        _ <span class="op">=&gt;</span> <span class="bool-val">false</span>,
    }
}

<span class="kw">fn</span> <span class="ident">checkadd</span>(<span class="ident">x</span>: <span class="ident">usize</span>, <span class="ident">y</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="ident">x</span>.<span class="ident">checked_add</span>(<span class="ident">y</span>).<span class="ident">expect</span>(<span class="string">&quot;regex length overflow&quot;</span>)
}

<span class="kw">fn</span> <span class="ident">unicode_class</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CharClass</span><span class="op">&gt;</span> {
    <span class="ident">UNICODE_CLASSES</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="kw-2">&amp;</span>(<span class="ident">s</span>, _)<span class="op">|</span> <span class="ident">s</span>.<span class="ident">cmp</span>(<span class="ident">name</span>)).<span class="ident">ok</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
        <span class="ident">raw_class_to_expr</span>(<span class="ident">UNICODE_CLASSES</span>[<span class="ident">i</span>].<span class="number">1</span>)
    })
}

<span class="kw">fn</span> <span class="ident">ascii_class</span>(<span class="ident">name</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CharClass</span><span class="op">&gt;</span> {
    <span class="ident">ASCII_CLASSES</span>.<span class="ident">binary_search_by</span>(<span class="op">|</span><span class="kw-2">&amp;</span>(<span class="ident">s</span>, _)<span class="op">|</span> <span class="ident">s</span>.<span class="ident">cmp</span>(<span class="ident">name</span>)).<span class="ident">ok</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> {
        <span class="ident">raw_class_to_expr</span>(<span class="ident">ASCII_CLASSES</span>[<span class="ident">i</span>].<span class="number">1</span>)
    })
}

<span class="kw">fn</span> <span class="ident">raw_class_to_expr</span>(<span class="ident">raw</span>: <span class="kw-2">&amp;</span>[(<span class="ident">char</span>, <span class="ident">char</span>)]) <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
    <span class="kw">let</span> <span class="ident">range</span> <span class="op">=</span> <span class="op">|</span><span class="kw-2">&amp;</span>(<span class="ident">s</span>, <span class="ident">e</span>)<span class="op">|</span> <span class="ident">ClassRange</span> { <span class="ident">start</span>: <span class="ident">s</span>, <span class="ident">end</span>: <span class="ident">e</span> };
    <span class="ident">CharClass</span>::<span class="ident">new</span>(<span class="ident">raw</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="ident">range</span>).<span class="ident">collect</span>())
}

<span class="kw">type</span> <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [(<span class="ident">char</span>, <span class="ident">char</span>)];
<span class="kw">type</span> <span class="ident">NamedClasses</span> <span class="op">=</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>, <span class="ident">Class</span>)];

<span class="kw">const</span> <span class="ident">ASCII_CLASSES</span>: <span class="ident">NamedClasses</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[
    <span class="comment">// Classes must be in alphabetical order so that bsearch works.</span>
    <span class="comment">// [:alnum:]      alphanumeric (== [0-9A-Za-z])</span>
    <span class="comment">// [:alpha:]      alphabetic (== [A-Za-z])</span>
    <span class="comment">// [:ascii:]      ASCII (== [\x00-\x7F])</span>
    <span class="comment">// [:blank:]      blank (== [\t ])</span>
    <span class="comment">// [:cntrl:]      control (== [\x00-\x1F\x7F])</span>
    <span class="comment">// [:digit:]      digits (== [0-9])</span>
    <span class="comment">// [:graph:]      graphical (== [!-~])</span>
    <span class="comment">// [:lower:]      lower case (== [a-z])</span>
    <span class="comment">// [:print:]      printable (== [ -~] == [ [:graph:]])</span>
    <span class="comment">// [:punct:]      punctuation (== [!-/:-@[-`{-~])</span>
    <span class="comment">// [:space:]      whitespace (== [\t\n\v\f\r ])</span>
    <span class="comment">// [:upper:]      upper case (== [A-Z])</span>
    <span class="comment">// [:word:]       word characters (== [0-9A-Za-z_])</span>
    <span class="comment">// [:xdigit:]     hex digit (== [0-9A-Fa-f])</span>
    <span class="comment">// Taken from: http://golang.org/pkg/regex/syntax/</span>
    (<span class="string">&quot;alnum&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">ALNUM</span>),
    (<span class="string">&quot;alpha&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">ALPHA</span>),
    (<span class="string">&quot;ascii&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">ASCII</span>),
    (<span class="string">&quot;blank&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">BLANK</span>),
    (<span class="string">&quot;cntrl&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">CNTRL</span>),
    (<span class="string">&quot;digit&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">DIGIT</span>),
    (<span class="string">&quot;graph&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">GRAPH</span>),
    (<span class="string">&quot;lower&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">LOWER</span>),
    (<span class="string">&quot;print&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">PRINT</span>),
    (<span class="string">&quot;punct&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">PUNCT</span>),
    (<span class="string">&quot;space&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">SPACE</span>),
    (<span class="string">&quot;upper&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">UPPER</span>),
    (<span class="string">&quot;word&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">WORD</span>),
    (<span class="string">&quot;xdigit&quot;</span>, <span class="kw-2">&amp;</span><span class="ident">XDIGIT</span>),
];

<span class="kw">const</span> <span class="ident">ALNUM</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;0&#39;</span>, <span class="string">&#39;9&#39;</span>), (<span class="string">&#39;A&#39;</span>, <span class="string">&#39;Z&#39;</span>), (<span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)];
<span class="kw">const</span> <span class="ident">ALPHA</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;A&#39;</span>, <span class="string">&#39;Z&#39;</span>), (<span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)];
<span class="kw">const</span> <span class="ident">ASCII</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;\x00&#39;</span>, <span class="string">&#39;\x7F&#39;</span>)];
<span class="kw">const</span> <span class="ident">BLANK</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39; &#39;</span>, <span class="string">&#39; &#39;</span>), (<span class="string">&#39;\t&#39;</span>, <span class="string">&#39;\t&#39;</span>)];
<span class="kw">const</span> <span class="ident">CNTRL</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;\x00&#39;</span>, <span class="string">&#39;\x1F&#39;</span>), (<span class="string">&#39;\x7F&#39;</span>, <span class="string">&#39;\x7F&#39;</span>)];
<span class="kw">const</span> <span class="ident">DIGIT</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;0&#39;</span>, <span class="string">&#39;9&#39;</span>)];
<span class="kw">const</span> <span class="ident">GRAPH</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;!&#39;</span>, <span class="string">&#39;~&#39;</span>)];
<span class="kw">const</span> <span class="ident">LOWER</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)];
<span class="kw">const</span> <span class="ident">PRINT</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39; &#39;</span>, <span class="string">&#39;~&#39;</span>)];
<span class="kw">const</span> <span class="ident">PUNCT</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;!&#39;</span>, <span class="string">&#39;/&#39;</span>), (<span class="string">&#39;:&#39;</span>, <span class="string">&#39;@&#39;</span>), (<span class="string">&#39;[&#39;</span>, <span class="string">&#39;`&#39;</span>), (<span class="string">&#39;{&#39;</span>, <span class="string">&#39;~&#39;</span>)];
<span class="kw">const</span> <span class="ident">SPACE</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;\t&#39;</span>, <span class="string">&#39;\t&#39;</span>), (<span class="string">&#39;\n&#39;</span>, <span class="string">&#39;\n&#39;</span>), (<span class="string">&#39;\x0B&#39;</span>, <span class="string">&#39;\x0B&#39;</span>),
                       (<span class="string">&#39;\x0C&#39;</span>, <span class="string">&#39;\x0C&#39;</span>), (<span class="string">&#39;\r&#39;</span>, <span class="string">&#39;\r&#39;</span>), (<span class="string">&#39; &#39;</span>, <span class="string">&#39; &#39;</span>)];
<span class="kw">const</span> <span class="ident">UPPER</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;A&#39;</span>, <span class="string">&#39;Z&#39;</span>)];
<span class="kw">const</span> <span class="ident">WORD</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;0&#39;</span>, <span class="string">&#39;9&#39;</span>), (<span class="string">&#39;A&#39;</span>, <span class="string">&#39;Z&#39;</span>), (<span class="string">&#39;_&#39;</span>, <span class="string">&#39;_&#39;</span>), (<span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)];
<span class="kw">const</span> <span class="ident">XDIGIT</span>: <span class="ident">Class</span> <span class="op">=</span> <span class="kw-2">&amp;</span>[(<span class="string">&#39;0&#39;</span>, <span class="string">&#39;9&#39;</span>), (<span class="string">&#39;A&#39;</span>, <span class="string">&#39;F&#39;</span>), (<span class="string">&#39;a&#39;</span>, <span class="string">&#39;f&#39;</span>)];

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> {
        <span class="ident">CharClass</span>, <span class="ident">ClassRange</span>, <span class="ident">ByteClass</span>, <span class="ident">ByteRange</span>,
        <span class="ident">Expr</span>, <span class="ident">Repeater</span>,
        <span class="ident">ErrorKind</span>,
    };
    <span class="kw">use</span> <span class="ident">unicode</span>::<span class="ident">regex</span>::{<span class="ident">PERLD</span>, <span class="ident">PERLS</span>, <span class="ident">PERLW</span>};
    <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">LOWER</span>, <span class="ident">UPPER</span>, <span class="ident">WORD</span>, <span class="ident">Flags</span>, <span class="ident">Parser</span>, <span class="ident">ascii_class</span>};

    <span class="kw">static</span> <span class="ident">YI</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [(<span class="ident">char</span>, <span class="ident">char</span>)] <span class="op">=</span> <span class="kw-2">&amp;</span>[
        (<span class="string">&#39;\u{a000}&#39;</span>, <span class="string">&#39;\u{a48c}&#39;</span>), (<span class="string">&#39;\u{a490}&#39;</span>, <span class="string">&#39;\u{a4c6}&#39;</span>),
    ];

    <span class="kw">fn</span> <span class="ident">p</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> { <span class="ident">Parser</span>::<span class="ident">parse</span>(<span class="ident">s</span>, <span class="ident">Flags</span>::<span class="ident">default</span>()).<span class="ident">unwrap</span>() }
    <span class="kw">fn</span> <span class="ident">pf</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">flags</span>: <span class="ident">Flags</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> { <span class="ident">Parser</span>::<span class="ident">parse</span>(<span class="ident">s</span>, <span class="ident">flags</span>).<span class="ident">unwrap</span>() }
    <span class="kw">fn</span> <span class="ident">lit</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> { <span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">c</span>], <span class="ident">casei</span>: <span class="bool-val">false</span> } }
    <span class="kw">fn</span> <span class="ident">liti</span>(<span class="ident">c</span>: <span class="ident">char</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> { <span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">c</span>], <span class="ident">casei</span>: <span class="bool-val">true</span> } }
    <span class="kw">fn</span> <span class="ident">b</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">v</span>: <span class="ident">T</span>) <span class="op">-&gt;</span> <span class="ident">Box</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> { <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">v</span>) }
    <span class="kw">fn</span> <span class="ident">c</span>(<span class="ident">es</span>: <span class="kw-2">&amp;</span>[<span class="ident">Expr</span>]) <span class="op">-&gt;</span> <span class="ident">Expr</span> { <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="ident">es</span>.<span class="ident">to_vec</span>()) }

    <span class="kw">fn</span> <span class="ident">pb</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">allow_bytes</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="ident">Parser</span>::<span class="ident">parse</span>(<span class="ident">s</span>, <span class="ident">flags</span>).<span class="ident">unwrap</span>()
    }

    <span class="kw">fn</span> <span class="ident">blit</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> {
        <span class="ident">Expr</span>::<span class="ident">LiteralBytes</span> {
            <span class="ident">bytes</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">b</span>],
            <span class="ident">casei</span>: <span class="bool-val">false</span>,
        }
    }

    <span class="kw">fn</span> <span class="ident">bliti</span>(<span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">Expr</span> {
        <span class="ident">Expr</span>::<span class="ident">LiteralBytes</span> {
            <span class="ident">bytes</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="ident">b</span>],
            <span class="ident">casei</span>: <span class="bool-val">true</span>,
        }
    }

    <span class="kw">fn</span> <span class="ident">class</span>(<span class="ident">ranges</span>: <span class="kw-2">&amp;</span>[(<span class="ident">char</span>, <span class="ident">char</span>)]) <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="kw">let</span> <span class="ident">ranges</span> <span class="op">=</span> <span class="ident">ranges</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()
                           .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">c1</span>, <span class="ident">c2</span>)<span class="op">|</span> <span class="ident">ClassRange</span>::<span class="ident">new</span>(<span class="ident">c1</span>, <span class="ident">c2</span>)).<span class="ident">collect</span>();
        <span class="ident">CharClass</span>::<span class="ident">new</span>(<span class="ident">ranges</span>)
    }

    <span class="kw">fn</span> <span class="ident">classes</span>(<span class="ident">classes</span>: <span class="kw-2">&amp;</span>[<span class="kw-2">&amp;</span>[(<span class="ident">char</span>, <span class="ident">char</span>)]]) <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">empty</span>();
        <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="ident">ranges</span> <span class="kw">in</span> <span class="ident">classes</span> {
            <span class="ident">cls</span>.<span class="ident">ranges</span>.<span class="ident">extend</span>(<span class="ident">class</span>(<span class="ident">ranges</span>));
        }
        <span class="ident">cls</span>.<span class="ident">canonicalize</span>()
    }

    <span class="kw">fn</span> <span class="ident">bclass</span>(<span class="ident">ranges</span>: <span class="kw-2">&amp;</span>[(<span class="ident">u8</span>, <span class="ident">u8</span>)]) <span class="op">-&gt;</span> <span class="ident">ByteClass</span> {
        <span class="kw">let</span> <span class="ident">ranges</span> <span class="op">=</span> <span class="ident">ranges</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()
                           .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">c1</span>, <span class="ident">c2</span>)<span class="op">|</span> <span class="ident">ByteRange</span>::<span class="ident">new</span>(<span class="ident">c1</span>, <span class="ident">c2</span>)).<span class="ident">collect</span>();
        <span class="ident">ByteClass</span>::<span class="ident">new</span>(<span class="ident">ranges</span>)
    }

    <span class="kw">fn</span> <span class="ident">asciid</span>() <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="ident">ascii_class</span>(<span class="string">&quot;digit&quot;</span>).<span class="ident">unwrap</span>()
    }

    <span class="kw">fn</span> <span class="ident">asciis</span>() <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="ident">ascii_class</span>(<span class="string">&quot;space&quot;</span>).<span class="ident">unwrap</span>()
    }

    <span class="kw">fn</span> <span class="ident">asciiw</span>() <span class="op">-&gt;</span> <span class="ident">CharClass</span> {
        <span class="ident">ascii_class</span>(<span class="string">&quot;word&quot;</span>).<span class="ident">unwrap</span>()
    }

    <span class="kw">fn</span> <span class="ident">asciid_bytes</span>() <span class="op">-&gt;</span> <span class="ident">ByteClass</span> {
        <span class="ident">asciid</span>().<span class="ident">to_byte_class</span>()
    }

    <span class="kw">fn</span> <span class="ident">asciis_bytes</span>() <span class="op">-&gt;</span> <span class="ident">ByteClass</span> {
        <span class="ident">asciis</span>().<span class="ident">to_byte_class</span>()
    }

    <span class="kw">fn</span> <span class="ident">asciiw_bytes</span>() <span class="op">-&gt;</span> <span class="ident">ByteClass</span> {
        <span class="ident">asciiw</span>().<span class="ident">to_byte_class</span>()
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">empty</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Empty</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">literal</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a&quot;</span>), <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)a&quot;</span>), <span class="ident">blit</span>(<span class="string">b&#39;a&#39;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">literal_string</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;ab&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)ab&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">blit</span>(<span class="string">b&#39;a&#39;</span>), <span class="ident">blit</span>(<span class="string">b&#39;b&#39;</span>)]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">start_literal</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;^a&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">Expr</span>::<span class="ident">StartText</span>,
            <span class="ident">Expr</span>::<span class="ident">Literal</span> { <span class="ident">chars</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="string">&#39;a&#39;</span>], <span class="ident">casei</span>: <span class="bool-val">false</span> },
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_zero_or_one_greedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span>,
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_zero_or_one_greedy_concat</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;ab?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
            <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)),
                <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span>,
                <span class="ident">greedy</span>: <span class="bool-val">true</span>,
            },
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_zero_or_one_nongreedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a??&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrOne</span>,
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_one_or_more_greedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a+&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">OneOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_one_or_more_nongreedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a+?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">OneOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_zero_or_more_greedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a*&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_zero_or_more_nongreedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a*?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_exact</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{5}&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="number">5</span>) },
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_min</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{5,}&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">None</span> },
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_min_max</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{5,10}&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="number">10</span>) },
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_exact_nongreedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{5}?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="number">5</span>) },
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_min_nongreedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{5,}?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">None</span> },
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_min_max_nongreedy</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{5,10}?&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="number">10</span>) },
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">repeat_counted_whitespace</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{ 5   }&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="number">5</span>) },
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a{ 5 , 10 }&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">Range</span> { <span class="ident">min</span>: <span class="number">5</span>, <span class="ident">max</span>: <span class="prelude-val">Some</span>(<span class="number">10</span>) },
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_literal</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(a)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_literal_concat</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(ab)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)])),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_two</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a|b&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_many</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;a|b|c&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_many_concat</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;ab|bc|cd&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)]),
            <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>)]),
            <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;d&#39;</span>)]),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_group_two</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(a|b)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)])),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_group_many</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(a|b|c)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>)])),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_group_many_concat</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(ab|bc|cd)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)]),
                <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>)]),
                <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;d&#39;</span>)]),
            ])),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">alt_group_nested</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(ab|(bc|(cd)))&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[
                <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>)]),
                <span class="ident">Expr</span>::<span class="ident">Group</span> {
                    <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[
                        <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>)]),
                        <span class="ident">Expr</span>::<span class="ident">Group</span> {
                            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;d&#39;</span>)])),
                            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">3</span>),
                            <span class="ident">name</span>: <span class="prelude-val">None</span>,
                        }
                    ])),
                    <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">2</span>),
                    <span class="ident">name</span>: <span class="prelude-val">None</span>,
                },
            ])),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_name</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?P&lt;foo&gt;a)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">into</span>()),
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_no_capture</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?:a)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">None</span>,
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_flags</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i:a)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">None</span>,
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u:a)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">bliti</span>(<span class="string">b&#39;a&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">None</span>,
            <span class="ident">name</span>: <span class="prelude-val">None</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_flags_returned</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i:a)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">i</span>: <span class="prelude-val">None</span>,
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
        ]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u:a)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">bliti</span>(<span class="string">b&#39;a&#39;</span>)),
                <span class="ident">i</span>: <span class="prelude-val">None</span>,
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">group_flags_retained</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)(?-i:a)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">i</span>: <span class="prelude-val">None</span>,
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
            <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>),
        ]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u)(?u-i:a)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">i</span>: <span class="prelude-val">None</span>,
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
            <span class="ident">bliti</span>(<span class="string">b&#39;a&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_inline</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)a&quot;</span>), <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_inline_multiple</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?is)a.&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">Expr</span>::<span class="ident">AnyChar</span>]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_inline_multiline</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?m)^(?-m)$&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">Expr</span>::<span class="ident">StartLine</span>, <span class="ident">Expr</span>::<span class="ident">EndText</span>]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_inline_swap_greed</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?U)a*a*?(?i-U)a*a*?&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
                <span class="ident">greedy</span>: <span class="bool-val">false</span>,
            },
            <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
                <span class="ident">greedy</span>: <span class="bool-val">true</span>,
            },
            <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
                <span class="ident">greedy</span>: <span class="bool-val">true</span>,
            },
            <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
                <span class="ident">greedy</span>: <span class="bool-val">false</span>,
            },
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_inline_multiple_negate_one</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?is)a.(?i-s)a.&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">Expr</span>::<span class="ident">AnyChar</span>, <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">Expr</span>::<span class="ident">AnyCharNoNL</span>,
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">any_byte</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">pb</span>(<span class="string">&quot;(?-u).(?u).&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">Expr</span>::<span class="ident">AnyByteNoNL</span>, <span class="ident">Expr</span>::<span class="ident">AnyCharNoNL</span>]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">pb</span>(<span class="string">&quot;(?s)(?-u).(?u).&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">Expr</span>::<span class="ident">AnyByte</span>, <span class="ident">Expr</span>::<span class="ident">AnyChar</span>]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_inline_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)a(?-i)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_group_inline</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(a(?i)a)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>)])),
                <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_group_inline_retain</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)((?-i)a)a&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
                <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
            <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_default_casei</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">casei</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pf</span>(<span class="string">&quot;a&quot;</span>, <span class="ident">flags</span>), <span class="ident">liti</span>(<span class="string">&#39;a&#39;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_default_multi</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">multi</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pf</span>(<span class="string">&quot;^&quot;</span>, <span class="ident">flags</span>), <span class="ident">Expr</span>::<span class="ident">StartLine</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_default_dotnl</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">dotnl</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pf</span>(<span class="string">&quot;.&quot;</span>, <span class="ident">flags</span>), <span class="ident">Expr</span>::<span class="ident">AnyChar</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_default_swap_greed</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">swap_greed</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pf</span>(<span class="string">&quot;a+&quot;</span>, <span class="ident">flags</span>), <span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">OneOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">false</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">flags_default_ignore_space</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">ignore_space</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pf</span>(<span class="string">&quot; a &quot;</span>, <span class="ident">flags</span>), <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_simple</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\a\f\t\n\r\v&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">lit</span>(<span class="string">&#39;\x07&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;\x0C&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;\t&#39;</span>),
            <span class="ident">lit</span>(<span class="string">&#39;\n&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;\r&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;\x0B&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_boundaries</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\A\z\b\B&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">StartText</span>, <span class="ident">Expr</span>::<span class="ident">EndText</span>,
            <span class="ident">Expr</span>::<span class="ident">WordBoundary</span>, <span class="ident">Expr</span>::<span class="ident">NotWordBoundary</span>,
        ]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\b\B&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">Expr</span>::<span class="ident">WordBoundaryAscii</span>, <span class="ident">Expr</span>::<span class="ident">NotWordBoundaryAscii</span>,
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_punctuation</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">lit</span>(<span class="string">&#39;\\&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;.&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;+&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;*&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;?&#39;</span>),
            <span class="ident">lit</span>(<span class="string">&#39;(&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;)&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;|&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;[&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;]&#39;</span>),
            <span class="ident">lit</span>(<span class="string">&#39;{&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;}&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;^&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;$&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;#&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_octal</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\123&quot;</span>), <span class="ident">lit</span>(<span class="string">&#39;S&#39;</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\1234&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;S&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;4&#39;</span>)]));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\377&quot;</span>), <span class="ident">blit</span>(<span class="number">0xFF</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_hex2</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\x53&quot;</span>), <span class="ident">lit</span>(<span class="string">&#39;S&#39;</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\x534&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;S&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;4&#39;</span>)]));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\xff&quot;</span>), <span class="ident">blit</span>(<span class="number">0xFF</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\x00&quot;</span>), <span class="ident">blit</span>(<span class="number">0x0</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[\x00]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;\x00&#39;</span>, <span class="string">b&#39;\x00&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\x00]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;\x01&#39;</span>, <span class="string">b&#39;\xFF&#39;</span>)])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_hex</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\x{53}&quot;</span>), <span class="ident">lit</span>(<span class="string">&#39;S&#39;</span>));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\x{53}4&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[<span class="ident">lit</span>(<span class="string">&#39;S&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;4&#39;</span>)]));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\x{2603}&quot;</span>), <span class="ident">lit</span>(<span class="string">&#39;\u{2603}&#39;</span>));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\x{00FF}&quot;</span>), <span class="ident">blit</span>(<span class="number">0xFF</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_name</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\p{Yi}&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">YI</span>)));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_letter</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\pZ&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\u{20}&#39;</span>, <span class="string">&#39;\u{20}&#39;</span>), (<span class="string">&#39;\u{a0}&#39;</span>, <span class="string">&#39;\u{a0}&#39;</span>),
            (<span class="string">&#39;\u{1680}&#39;</span>, <span class="string">&#39;\u{1680}&#39;</span>), (<span class="string">&#39;\u{2000}&#39;</span>, <span class="string">&#39;\u{200a}&#39;</span>),
            (<span class="string">&#39;\u{2028}&#39;</span>, <span class="string">&#39;\u{2029}&#39;</span>), (<span class="string">&#39;\u{202f}&#39;</span>, <span class="string">&#39;\u{202f}&#39;</span>),
            (<span class="string">&#39;\u{205f}&#39;</span>, <span class="string">&#39;\u{205f}&#39;</span>), (<span class="string">&#39;\u{3000}&#39;</span>, <span class="string">&#39;\u{3000}&#39;</span>),
        ])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_name_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\p{Yi}&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">YI</span>).<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_letter_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\pZ&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\u{20}&#39;</span>, <span class="string">&#39;\u{20}&#39;</span>), (<span class="string">&#39;\u{a0}&#39;</span>, <span class="string">&#39;\u{a0}&#39;</span>),
            (<span class="string">&#39;\u{1680}&#39;</span>, <span class="string">&#39;\u{1680}&#39;</span>), (<span class="string">&#39;\u{2000}&#39;</span>, <span class="string">&#39;\u{200a}&#39;</span>),
            (<span class="string">&#39;\u{2028}&#39;</span>, <span class="string">&#39;\u{2029}&#39;</span>), (<span class="string">&#39;\u{202f}&#39;</span>, <span class="string">&#39;\u{202f}&#39;</span>),
            (<span class="string">&#39;\u{205f}&#39;</span>, <span class="string">&#39;\u{205f}&#39;</span>), (<span class="string">&#39;\u{3000}&#39;</span>, <span class="string">&#39;\u{3000}&#39;</span>),
        ]).<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_name_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\P{Yi}&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">YI</span>).<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_letter_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\PZ&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\u{20}&#39;</span>, <span class="string">&#39;\u{20}&#39;</span>), (<span class="string">&#39;\u{a0}&#39;</span>, <span class="string">&#39;\u{a0}&#39;</span>),
            (<span class="string">&#39;\u{1680}&#39;</span>, <span class="string">&#39;\u{1680}&#39;</span>), (<span class="string">&#39;\u{2000}&#39;</span>, <span class="string">&#39;\u{200a}&#39;</span>),
            (<span class="string">&#39;\u{2028}&#39;</span>, <span class="string">&#39;\u{2029}&#39;</span>), (<span class="string">&#39;\u{202f}&#39;</span>, <span class="string">&#39;\u{202f}&#39;</span>),
            (<span class="string">&#39;\u{205f}&#39;</span>, <span class="string">&#39;\u{205f}&#39;</span>), (<span class="string">&#39;\u{3000}&#39;</span>, <span class="string">&#39;\u{3000}&#39;</span>),
        ]).<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_name_negate_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\P{Yi}&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">YI</span>).<span class="ident">negate</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_unicode_letter_negate_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\PZ&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\u{20}&#39;</span>, <span class="string">&#39;\u{20}&#39;</span>), (<span class="string">&#39;\u{a0}&#39;</span>, <span class="string">&#39;\u{a0}&#39;</span>),
            (<span class="string">&#39;\u{1680}&#39;</span>, <span class="string">&#39;\u{1680}&#39;</span>), (<span class="string">&#39;\u{2000}&#39;</span>, <span class="string">&#39;\u{200a}&#39;</span>),
            (<span class="string">&#39;\u{2028}&#39;</span>, <span class="string">&#39;\u{2029}&#39;</span>), (<span class="string">&#39;\u{202f}&#39;</span>, <span class="string">&#39;\u{202f}&#39;</span>),
            (<span class="string">&#39;\u{205f}&#39;</span>, <span class="string">&#39;\u{205f}&#39;</span>), (<span class="string">&#39;\u{3000}&#39;</span>, <span class="string">&#39;\u{3000}&#39;</span>),
        ]).<span class="ident">negate</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_d</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\d&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\d&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciid</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_s</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\s&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\s&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciis</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_w</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\w&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\w&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciiw</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_d_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\D&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\D&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciid</span>().<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_s_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\S&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>).<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\S&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciis</span>().<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_w_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;\W&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)\W&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciiw</span>().<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_d_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\d&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)\d&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciid</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_s_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\s&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)\s&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciis</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_w_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\w&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)\w&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">asciiw</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_d_case_fold_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\D&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciid</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)\D&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">bytes</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_s_case_fold_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\S&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciis</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)\S&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">bytes</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">escape_perl_w_case_fold_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)\W&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciiw</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)\W&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">bytes</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[a]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;a&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\x00]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;\x00&#39;</span>, <span class="string">&#39;\x00&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\n]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;\n&#39;</span>, <span class="string">&#39;\n&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[\n]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;\n&#39;</span>, <span class="string">&#39;\n&#39;</span>)])));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[a]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;a&#39;</span>, <span class="string">b&#39;a&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[\x00]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="number">0</span>, <span class="number">0</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[\xFF]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="number">0xFF</span>, <span class="number">0xFF</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[\n]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;\n&#39;</span>, <span class="string">b&#39;\n&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[\n]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;\n&#39;</span>, <span class="string">b&#39;\n&#39;</span>)])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^a]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\x00&#39;</span>, <span class="string">&#39;\x60&#39;</span>), (<span class="string">&#39;\x62&#39;</span>, <span class="string">&#39;\u{10FFFF}&#39;</span>),
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\x00]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\x01&#39;</span>, <span class="string">&#39;\u{10FFFF}&#39;</span>),
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\n]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\x00&#39;</span>, <span class="string">&#39;\x09&#39;</span>), (<span class="string">&#39;\x0b&#39;</span>, <span class="string">&#39;\u{10FFFF}&#39;</span>),
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[^\n]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[
            (<span class="string">&#39;\x00&#39;</span>, <span class="string">&#39;\x09&#39;</span>), (<span class="string">&#39;\x0b&#39;</span>, <span class="string">&#39;\u{10FFFF}&#39;</span>),
        ])));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^a]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[
            (<span class="number">0x00</span>, <span class="number">0x60</span>), (<span class="number">0x62</span>, <span class="number">0xFF</span>),
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\x00]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[
            (<span class="number">0x01</span>, <span class="number">0xFF</span>),
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\n]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[
            (<span class="number">0x00</span>, <span class="number">0x09</span>), (<span class="number">0x0B</span>, <span class="number">0xFF</span>),
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[^\n]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[
            (<span class="number">0x00</span>, <span class="number">0x09</span>), (<span class="number">0x0B</span>, <span class="number">0xFF</span>),
        ])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_class</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\d]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\p{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">YI</span>)));

        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">to_byte_class</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[\d]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_class_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\d]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\w]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\s]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>).<span class="ident">negate</span>()));

        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciid_bytes</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\d]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciiw_bytes</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\w]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciis_bytes</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\s]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_class_negate_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\D]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\W]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\S]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\D]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciid_bytes</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\W]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciiw_bytes</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?-u)[^\S]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciis_bytes</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_class_casei</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[\d]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[\p{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">YI</span>).<span class="ident">case_fold</span>()));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[\d]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciid_bytes</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_class_negate_casei</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\d]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\w]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\s]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));

        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciid_bytes</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[^\d]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciiw_bytes</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[^\w]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
        <span class="kw">let</span> <span class="ident">bytes</span> <span class="op">=</span> <span class="ident">asciis_bytes</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[^\s]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bytes</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_singleton_class_negate_negate_casei</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\D]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\W]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\S]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLS</span>).<span class="ident">case_fold</span>()));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[^\D]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciid_bytes</span>().<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[^\W]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciiw_bytes</span>().<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">r&quot;(?i-u)[^\S]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">asciis_bytes</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_multiple_class</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\d\p{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">PERLD</span>, <span class="ident">YI</span>,
        ])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_multiple_class_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\d\p{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">PERLD</span>, <span class="ident">YI</span>,
        ]).<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_multiple_class_negate_negate</span>() {
        <span class="kw">let</span> <span class="ident">nperlw</span> <span class="op">=</span> <span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">negate</span>();
        <span class="kw">let</span> <span class="ident">nyi</span> <span class="op">=</span> <span class="ident">class</span>(<span class="ident">YI</span>).<span class="ident">negate</span>();
        <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">empty</span>().<span class="ident">merge</span>(<span class="ident">nperlw</span>).<span class="ident">merge</span>(<span class="ident">nyi</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[^\W\P{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">cls</span>.<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_multiple_class_casei</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[\d\p{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">PERLD</span>, <span class="ident">YI</span>,
        ]).<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_multiple_class_negate_casei</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\d\p{Yi}]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">PERLD</span>, <span class="ident">YI</span>,
        ]).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_multiple_class_negate_negate_casei</span>() {
        <span class="kw">let</span> <span class="ident">nperlw</span> <span class="op">=</span> <span class="ident">class</span>(<span class="ident">PERLW</span>).<span class="ident">negate</span>();
        <span class="kw">let</span> <span class="ident">nyi</span> <span class="op">=</span> <span class="ident">class</span>(<span class="ident">YI</span>).<span class="ident">negate</span>();
        <span class="kw">let</span> <span class="ident">class</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">empty</span>().<span class="ident">merge</span>(<span class="ident">nperlw</span>).<span class="ident">merge</span>(<span class="ident">nyi</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?i)[^\W\P{Yi}]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>.<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_class_hypen</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\p{Yi}-]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[
            <span class="kw-2">&amp;</span>[(<span class="string">&#39;-&#39;</span>, <span class="string">&#39;-&#39;</span>)], <span class="ident">YI</span>,
        ])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;[\p{Yi}-a]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[
            <span class="kw-2">&amp;</span>[(<span class="string">&#39;-&#39;</span>, <span class="string">&#39;-&#39;</span>)], <span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;a&#39;</span>)], <span class="ident">YI</span>,
        ])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_brackets</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;]&#39;</span>, <span class="string">&#39;]&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[][]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;[&#39;</span>, <span class="string">&#39;[&#39;</span>), (<span class="string">&#39;]&#39;</span>, <span class="string">&#39;]&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[[]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;[&#39;</span>, <span class="string">&#39;[&#39;</span>)])),
            <span class="ident">lit</span>(<span class="string">&#39;]&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_brackets_hypen</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[]-]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;-&#39;</span>, <span class="string">&#39;-&#39;</span>), (<span class="string">&#39;]&#39;</span>, <span class="string">&#39;]&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[-]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;-&#39;</span>, <span class="string">&#39;-&#39;</span>)])),
            <span class="ident">lit</span>(<span class="string">&#39;]&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">class_overlapping</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[a-fd-h]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;h&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[a-fg-m]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;m&#39;</span>)])));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[a-fd-h]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;a&#39;</span>, <span class="string">b&#39;h&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[a-fg-m]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;a&#39;</span>, <span class="string">b&#39;m&#39;</span>)])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[:upper:]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[[:upper:]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[:upper:]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[[:upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">to_byte_class</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes_not</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[:abc:]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;:&#39;</span>, <span class="string">&#39;:&#39;</span>), (<span class="string">&#39;a&#39;</span>, <span class="string">&#39;c&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[:abc:]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">bclass</span>(<span class="kw-2">&amp;</span>[(<span class="string">b&#39;:&#39;</span>, <span class="string">b&#39;:&#39;</span>), (<span class="string">b&#39;a&#39;</span>, <span class="string">b&#39;c&#39;</span>)])));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes_multiple</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[[:lower:][:upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[<span class="ident">UPPER</span>, <span class="ident">LOWER</span>])));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[[:lower:][:upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">classes</span>(<span class="kw-2">&amp;</span>[<span class="ident">UPPER</span>, <span class="ident">LOWER</span>]).<span class="ident">to_byte_class</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes_negate</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[[:^upper:]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[^[:^upper:]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>)));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[[:^upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">to_byte_class</span>().<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?-u)[^[:^upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">to_byte_class</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes_negate_multiple</span>() {
        <span class="kw">let</span> (<span class="ident">nlower</span>, <span class="ident">nword</span>) <span class="op">=</span> (<span class="ident">class</span>(<span class="ident">LOWER</span>).<span class="ident">negate</span>(), <span class="ident">class</span>(<span class="ident">WORD</span>).<span class="ident">negate</span>());
        <span class="kw">let</span> <span class="ident">cls</span> <span class="op">=</span> <span class="ident">CharClass</span>::<span class="ident">empty</span>().<span class="ident">merge</span>(<span class="ident">nlower</span>).<span class="ident">merge</span>(<span class="ident">nword</span>);
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[[:^lower:][:^word:]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">cls</span>.<span class="ident">clone</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;[^[:^lower:][:^word:]]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">cls</span>.<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)[:upper:]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)[[:upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">case_fold</span>()));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u)[:upper:]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">case_fold</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u)[[:upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">to_byte_class</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ascii_classes_negate_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)[[:^upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)[^[:^upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">case_fold</span>()));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u)[[:^upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(
                       <span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">to_byte_class</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u)[^[:^upper:]]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(<span class="ident">class</span>(<span class="ident">UPPER</span>).<span class="ident">to_byte_class</span>().<span class="ident">case_fold</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">single_class_negate_case_fold</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?i)[^x]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;x&#39;</span>, <span class="string">&#39;x&#39;</span>)]).<span class="ident">case_fold</span>().<span class="ident">negate</span>()));

        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">pb</span>(<span class="string">&quot;(?i-u)[^x]&quot;</span>),
                   <span class="ident">Expr</span>::<span class="ident">ClassBytes</span>(
                       <span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;x&#39;</span>, <span class="string">&#39;x&#39;</span>)])
                       .<span class="ident">to_byte_class</span>().<span class="ident">case_fold</span>().<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_empty</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?x) &quot;</span>), <span class="ident">Expr</span>::<span class="ident">Empty</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_literal</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?x) a b c&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_literal_off</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?x) a b c(?-x) a&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;b&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;c&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39; &#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_class</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?x)[a
        - z
]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)])));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">&quot;(?x)[  ^   a
        - z
]&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="kw-2">&amp;</span>[(<span class="string">&#39;a&#39;</span>, <span class="string">&#39;z&#39;</span>)]).<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_escape</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?x)\ d&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>)));
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?x)\
                     D&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>).<span class="ident">negate</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_comments</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?x)(?P&lt;foo&gt;
    a # comment 1
)(?P&lt;bar&gt;
    z # comment 2
)&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
        <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">1</span>),
            <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">into</span>()),
        },
        <span class="ident">Expr</span>::<span class="ident">Group</span> {
            <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">lit</span>(<span class="string">&#39;z&#39;</span>)),
            <span class="ident">i</span>: <span class="prelude-val">Some</span>(<span class="number">2</span>),
            <span class="ident">name</span>: <span class="prelude-val">Some</span>(<span class="string">&quot;bar&quot;</span>.<span class="ident">into</span>()),
        },
    ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_comments_re_enable</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?x)a # hi
(?-x:#) # sweet&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
            <span class="ident">Expr</span>::<span class="ident">Group</span> {
                <span class="ident">e</span>: <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">lit</span>(<span class="string">&#39;#&#39;</span>)),
                <span class="ident">i</span>: <span class="prelude-val">None</span>,
                <span class="ident">name</span>: <span class="prelude-val">None</span>,
            },
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_escape_punctuation</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?x)\\\.\+\*\?\(\)\|\[\]\{\}\^\$\#&quot;</span>), <span class="ident">c</span>(<span class="kw-2">&amp;</span>[
            <span class="ident">lit</span>(<span class="string">&#39;\\&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;.&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;+&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;*&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;?&#39;</span>),
            <span class="ident">lit</span>(<span class="string">&#39;(&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;)&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;|&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;[&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;]&#39;</span>),
            <span class="ident">lit</span>(<span class="string">&#39;{&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;}&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;^&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;$&#39;</span>), <span class="ident">lit</span>(<span class="string">&#39;#&#39;</span>),
        ]));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">ignore_space_escape_hash</span>() {
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>(<span class="string">r&quot;(?x)a\# # hi there&quot;</span>), <span class="ident">Expr</span>::<span class="ident">Concat</span>(<span class="macro">vec</span><span class="macro">!</span>[
            <span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>),
            <span class="ident">lit</span>(<span class="string">&#39;#&#39;</span>),
        ]));
    }

    <span class="comment">// Test every single possible error case.</span>

    <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">test_err</span> {
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pos</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">kind</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {
            <span class="macro">test_err</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pos</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">kind</span>, <span class="ident">Flags</span>::<span class="ident">default</span>());
        };
        (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">pos</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">kind</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">flags</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> {{
            <span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">Parser</span>::<span class="ident">parse</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">flags</span>).<span class="ident">unwrap_err</span>();
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pos</span>, <span class="ident">err</span>.<span class="ident">pos</span>);
            <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">kind</span>, <span class="ident">err</span>.<span class="ident">kind</span>);
            <span class="macro">assert</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">re</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">err</span>.<span class="ident">surround</span>));
        }}
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">invalid_utf8_not_allowed</span>() {
        <span class="comment">// let flags = Flags { unicode: false, .. Flags::default() };</span>
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)\xFF&quot;</span>, <span class="number">9</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u).&quot;</span>, <span class="number">5</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)(?s).&quot;</span>, <span class="number">9</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)[\x00-\x80]&quot;</span>, <span class="number">15</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)\222&quot;</span>, <span class="number">9</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)\x{0080}&quot;</span>, <span class="number">13</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidUtf8</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">unicode_char_not_allowed</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">allow_bytes</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;☃(?-u:☃)&quot;</span>, <span class="number">7</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">unicode_class_not_allowed</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">allow_bytes</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;☃(?-u:\pL)&quot;</span>, <span class="number">9</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">unicode_class_literal_not_allowed</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">allow_bytes</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)[☃]&quot;</span>, <span class="number">6</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)[☃-☃]&quot;</span>, <span class="number">6</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">unicode_hex_not_allowed</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">allow_bytes</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)\x{FFFF}&quot;</span>, <span class="number">13</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)\x{100}&quot;</span>, <span class="number">12</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">unicode_octal_not_allowed</span>() {
        <span class="kw">let</span> <span class="ident">flags</span> <span class="op">=</span> <span class="ident">Flags</span> { <span class="ident">allow_bytes</span>: <span class="bool-val">true</span>, .. <span class="ident">Flags</span>::<span class="ident">default</span>() };
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;(?-u)\400&quot;</span>, <span class="number">9</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnicodeNotAllowed</span>, <span class="ident">flags</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_no_expr_simple</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(*&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">RepeaterExpectsExpr</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_no_expr_counted</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;({5}&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">RepeaterExpectsExpr</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_beginning_counted</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;{5}&quot;</span>, <span class="number">0</span>, <span class="ident">ErrorKind</span>::<span class="ident">RepeaterExpectsExpr</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_illegal_exprs_simple</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a**&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">RepeaterUnexpectedExpr</span>(<span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        }));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a|*&quot;</span>, <span class="number">2</span>,
            <span class="ident">ErrorKind</span>::<span class="ident">RepeaterUnexpectedExpr</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)]))
        );
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_illegal_exprs_counted</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a*{5}&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">RepeaterUnexpectedExpr</span>(<span class="ident">Expr</span>::<span class="ident">Repeat</span> {
            <span class="ident">e</span>: <span class="ident">b</span>(<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)),
            <span class="ident">r</span>: <span class="ident">Repeater</span>::<span class="ident">ZeroOrMore</span>,
            <span class="ident">greedy</span>: <span class="bool-val">true</span>,
        }));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a|{5}&quot;</span>, <span class="number">2</span>,
            <span class="ident">ErrorKind</span>::<span class="ident">RepeaterUnexpectedExpr</span>(<span class="ident">Expr</span>::<span class="ident">Alternate</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">lit</span>(<span class="string">&#39;a&#39;</span>)]))
        );
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_empty_number</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{}&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">MissingBase10</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_eof</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{5&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedRepeat</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_empty_number_eof</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{xyz&quot;</span>, <span class="number">5</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="string">&quot;xyz&quot;</span>.<span class="ident">into</span>()));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{12,xyz&quot;</span>, <span class="number">8</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="string">&quot;xyz&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_invalid_number</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{9999999999}&quot;</span>, <span class="number">12</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="string">&quot;9999999999&quot;</span>.<span class="ident">into</span>()));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{1,9999999999}&quot;</span>, <span class="number">14</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="string">&quot;9999999999&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_invalid_number_extra</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{12x}&quot;</span>, <span class="number">5</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="string">&quot;12x&quot;</span>.<span class="ident">into</span>()));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{1,12x}&quot;</span>, <span class="number">7</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase10</span>(<span class="string">&quot;12x&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_repeat_invalid_range</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a{2,1}&quot;</span>, <span class="number">5</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidRepeatRange</span> { <span class="ident">min</span>: <span class="number">2</span>, <span class="ident">max</span>: <span class="number">1</span> });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_alternate_empty</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;|a&quot;</span>, <span class="number">0</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_alternate_empty_with_group</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(|a)&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_alternate_empty_with_alternate</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a||&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_unopened_empty</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;)&quot;</span>, <span class="number">0</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnopenedParen</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_unopened</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;ab)&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnopenedParen</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_unopened_with_alt</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a|b)&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnopenedParen</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_unclosed_with_alt</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(a|b&quot;</span>, <span class="number">0</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedParen</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_empty_alt</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(a|)&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_empty_group</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;()&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyGroup</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_close_paren_empty_group_with_name</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?P&lt;foo&gt;)&quot;</span>, <span class="number">8</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyGroup</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_finish_concat_unclosed</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;ab(xy&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedParen</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_finish_concat_empty_alt</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;a|&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyAlternate</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_name_invalid</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?P&lt;a#&gt;x)&quot;</span>, <span class="number">6</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidCaptureName</span>(<span class="string">&quot;a#&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_name_invalid_leading</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?P&lt;1a&gt;a)&quot;</span>, <span class="number">6</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidCaptureName</span>(<span class="string">&quot;1a&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_name_unexpected_eof</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?P&lt;a&quot;</span>, <span class="number">5</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedCaptureName</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_name_empty</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?P&lt;&gt;a)&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyCaptureName</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_opts_unrecognized_flag</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?z:a)&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedFlag</span>(<span class="string">&#39;z&#39;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_opts_unexpected_eof</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?i&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedFlagEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_opts_double_negation</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?-i-s:a)&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">DoubleFlagNegation</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_opts_empty_negation</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?i-:a)&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyFlagNegation</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_group_opts_empty</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?)&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyFlagNegation</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_unexpected_eof</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedEscapeEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_unrecognized</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\m&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedEscape</span>(<span class="string">&#39;m&#39;</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex2_eof0</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedTwoDigitHexEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex2_eof1</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\xA&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedTwoDigitHexEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex2_invalid</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\xAG&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase16</span>(<span class="string">&quot;AG&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex_eof0</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x{&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase16</span>(<span class="string">&quot;&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex_eof1</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x{A&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedHex</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex_invalid</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x{AG}&quot;</span>, <span class="number">5</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase16</span>(<span class="string">&quot;AG&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex_invalid_scalar_value_surrogate</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x{D800}&quot;</span>, <span class="number">8</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidScalarValue</span>(<span class="number">0xD800</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex_invalid_scalar_value_high</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x{110000}&quot;</span>, <span class="number">10</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidScalarValue</span>(<span class="number">0x110000</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_escape_hex_invalid_u32</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\x{9999999999}&quot;</span>, <span class="number">13</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidBase16</span>(<span class="string">&quot;9999999999&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_unicode_unclosed</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\p{&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedUnicodeName</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\p{Greek&quot;</span>, <span class="number">8</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnclosedUnicodeName</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_unicode_no_letter</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\p&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedEscapeEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_unicode_unknown_letter</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\pA&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedUnicodeClass</span>(<span class="string">&quot;A&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_unicode_unknown_name</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;\p{Yii}&quot;</span>, <span class="number">7</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedUnicodeClass</span>(<span class="string">&quot;Yii&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_eof_empty</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[&quot;</span>, <span class="number">1</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[^&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_eof_non_empty</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[a&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[^a&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_eof_range</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[a-&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[^a-&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[---&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_invalid_escape</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;[\pA]&quot;</span>, <span class="number">4</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">UnrecognizedUnicodeClass</span>(<span class="string">&quot;A&quot;</span>.<span class="ident">into</span>()));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_valid_escape_not_allowed</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;[\A]&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidClassEscape</span>(<span class="ident">Expr</span>::<span class="ident">StartText</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_range_valid_escape_not_allowed</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;[a-\d]&quot;</span>, <span class="number">5</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidClassEscape</span>(<span class="ident">Expr</span>::<span class="ident">Class</span>(<span class="ident">class</span>(<span class="ident">PERLD</span>))));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;[a-\A]&quot;</span>, <span class="number">5</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidClassEscape</span>(<span class="ident">Expr</span>::<span class="ident">StartText</span>));
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;[\A-a]&quot;</span>, <span class="number">3</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">InvalidClassEscape</span>(<span class="ident">Expr</span>::<span class="ident">StartText</span>));
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_invalid_range</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[z-a]&quot;</span>, <span class="number">4</span>, <span class="ident">ErrorKind</span>::<span class="ident">InvalidClassRange</span> {
            <span class="ident">start</span>: <span class="string">&#39;z&#39;</span>,
            <span class="ident">end</span>: <span class="string">&#39;a&#39;</span>,
        });
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_class_empty_range</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[]&quot;</span>, <span class="number">2</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;[^]&quot;</span>, <span class="number">3</span>, <span class="ident">ErrorKind</span>::<span class="ident">UnexpectedClassEof</span>);
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">r&quot;[^\d\D]&quot;</span>, <span class="number">7</span>, <span class="ident">ErrorKind</span>::<span class="ident">EmptyClass</span>);
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">error_duplicate_capture_name</span>() {
        <span class="macro">test_err</span><span class="macro">!</span>(<span class="string">&quot;(?P&lt;a&gt;.)(?P&lt;a&gt;.)&quot;</span>, <span class="number">14</span>,
                  <span class="ident">ErrorKind</span>::<span class="ident">DuplicateCaptureName</span>(<span class="string">&quot;a&quot;</span>.<span class="ident">into</span>()));
    }
}
</pre>
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